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bobobox

  • one year ago

I need help with a couple question on two way frequency tables

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  1. bobobox
    • one year ago
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    ONce someone asks I will post a screencap

  2. jim_thompson5910
    • one year ago
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    go ahead

  3. bobobox
    • one year ago
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    okay

  4. bobobox
    • one year ago
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    @jim_thompson5910 heres the question

  5. jim_thompson5910
    • one year ago
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    ok one sec

  6. bobobox
    • one year ago
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    here is the options

  7. jim_thompson5910
    • one year ago
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    what are your thoughts on this?

  8. bobobox
    • one year ago
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    Im looking for a working pen one moment

  9. bobobox
    • one year ago
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    okay let me write down the problem

  10. jim_thompson5910
    • one year ago
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    ok

  11. bobobox
    • one year ago
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    sorry i just found my paper

  12. jim_thompson5910
    • one year ago
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    thats fine

  13. bobobox
    • one year ago
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    Okay so I think I need to look at the comlums and ad the two row in each colum together to see what number I must divde by?

  14. jim_thompson5910
    • one year ago
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    why divide?

  15. bobobox
    • one year ago
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    Well I would say so I have numbers to add together for the bottom row of my colum

  16. jim_thompson5910
    • one year ago
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    all they want you to do is rearrange the given info into a table then add up the rows to get the row totals afterwards, add up the columns to get the column totals no division is done at all

  17. bobobox
    • one year ago
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    really? Im having trouble so I watched a kahn academy video and they said to divide! Now I am really confused

  18. jim_thompson5910
    • one year ago
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    you divide if they wanted RELATIVE frequencies

  19. bobobox
    • one year ago
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    okay I need your help

  20. jim_thompson5910
    • one year ago
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    normal frequencies are counts (whole numbers) relative frequencies are percentages, fractions or decimal form

  21. bobobox
    • one year ago
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    okay what about two way frequecies

  22. jim_thompson5910
    • one year ago
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    how many men like playing sports

  23. bobobox
    • one year ago
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    11

  24. jim_thompson5910
    • one year ago
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    so "11" goes in the "Men" row and "Playing sports" column

  25. jim_thompson5910
    • one year ago
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    the other values are done in a similar way

  26. bobobox
    • one year ago
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    really thats it?

  27. jim_thompson5910
    • one year ago
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    yep

  28. jim_thompson5910
    • one year ago
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    again they just want normal frequencies

  29. bobobox
    • one year ago
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    so the answer is B

  30. jim_thompson5910
    • one year ago
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    correct

  31. jim_thompson5910
    • one year ago
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    notice how they have "row totals" and "column totals" do you see how those numbers were formed?

  32. bobobox
    • one year ago
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    Okay can you double check my answer for the next?

  33. jim_thompson5910
    • one year ago
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    sure

  34. bobobox
    • one year ago
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    heres the question

  35. bobobox
    • one year ago
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    I picked a

  36. jim_thompson5910
    • one year ago
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    now notice how the keyword "relative frequency" comes up

  37. jim_thompson5910
    • one year ago
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    it's not a simple count anymore

  38. jim_thompson5910
    • one year ago
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    that "relative" changes everything

  39. bobobox
    • one year ago
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    Oh do I divide with this one?

  40. jim_thompson5910
    • one year ago
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    yes division will play a part now

  41. bobobox
    • one year ago
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    okay let me take a crack at it. See I think I watched a video on realative

  42. jim_thompson5910
    • one year ago
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    yeah it sounds like it too

  43. bobobox
    • one year ago
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    I think its b!!!!!

  44. jim_thompson5910
    • one year ago
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    why B?

  45. bobobox
    • one year ago
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    because I was dividing the number in the colum/row by the colum total In the chart I made with they numbers I was given and got the same answers in the chart B!

  46. jim_thompson5910
    • one year ago
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    Notice there are 26 people who are in high school and like action this is out of 128 people total (see table in choice A or you can add up all the numbers)

  47. jim_thompson5910
    • one year ago
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    so the relative frequency of those who are in high school and love action movies is 26/128 = 0.203125 that rounds to 0.20

  48. jim_thompson5910
    • one year ago
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    in a normal frequency table, "26" goes in the "high school" and "action" column in a relative frequency table, "0.20" goes in the "high school" and "action" column (since 26/128 is roughly 0.20)

  49. bobobox
    • one year ago
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    one sec

  50. jim_thompson5910
    • one year ago
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    and like before, the other relative frequencies are calculated in a similar way

  51. bobobox
    • one year ago
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    so you divide by 128? I divded by 46

  52. jim_thompson5910
    • one year ago
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    why 46?

  53. bobobox
    • one year ago
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    it was that comlum total and I listened incorrectly

  54. bobobox
    • one year ago
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    oh im dividing by 128 and i get it now its D

  55. jim_thompson5910
    • one year ago
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    well when they mean "relative" without specifying anything further, they mean relative to the entire group so 26/128 = 0.20 roughly means that approximately 20% of the entire group is in high school and likes action movies if it said "relative to action movies" then it would work. Or if it said "of those who like action movies, what is the relative frequency of those in high school?" then it would work

  56. jim_thompson5910
    • one year ago
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    yeah it's D

  57. bobobox
    • one year ago
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    okay ready next one

  58. bobobox
    • one year ago
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  59. bobobox
    • one year ago
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    question

  60. bobobox
    • one year ago
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    Can you teach me what this means?

  61. jim_thompson5910
    • one year ago
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    let me look it over

  62. bobobox
    • one year ago
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    I want to say B for some reason because they didn't say relative

  63. bobobox
    • one year ago
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    @jim_thompson5910

  64. jim_thompson5910
    • one year ago
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    I'm still thinking on this one

  65. bobobox
    • one year ago
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    okay take your time

  66. jim_thompson5910
    • one year ago
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    ok hopefully I have the right interpretation

  67. bobobox
    • one year ago
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    okay

  68. jim_thompson5910
    • one year ago
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    they ask "Which of the following is a two-way conditional frequency table for gender?" so in a sense, they want to compare the results between genders (to see which percent like Aspen for instance)

  69. bobobox
    • one year ago
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    okay...

  70. jim_thompson5910
    • one year ago
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    it might help to take that original table and convert it to a frequency table (not a relative frequency table)

  71. jim_thompson5910
    • one year ago
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    let's say there are 100 people how many of those 100 people are male and like aspen?

  72. bobobox
    • one year ago
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    22%

  73. jim_thompson5910
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    22% of 100 = ???

  74. bobobox
    • one year ago
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    22

  75. jim_thompson5910
    • one year ago
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    how many females like aspen?

  76. bobobox
    • one year ago
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    16

  77. jim_thompson5910
    • one year ago
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    so 22+16 = 38 people like aspen

  78. bobobox
    • one year ago
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    okay aand 63 people like nyc

  79. jim_thompson5910
    • one year ago
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    22 males like aspen 38 people total like aspen if you just focus on aspen (ignore the other location), what is the percentage of males who like aspen?

  80. bobobox
    • one year ago
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    44% of males enjoy aspen

  81. jim_thompson5910
    • one year ago
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    ignore the other location

  82. bobobox
    • one year ago
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    okay,

  83. bobobox
    • one year ago
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    so is it still 22 or is it 44 i multiplied by 2 because it would make sense if there was one hundred men 44 enjoy aspen

  84. jim_thompson5910
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    22 males like aspen 38 people total like aspen 22/38 = ??

  85. bobobox
    • one year ago
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    0.57

  86. jim_thompson5910
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    22/38 = 0.57894736842106 which rounds to 0.58

  87. jim_thompson5910
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    so 58% of the people who like aspen are male

  88. bobobox
    • one year ago
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    okay

  89. jim_thompson5910
    • one year ago
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    fill in the blank ____ percent of the people who like aspen are female

  90. bobobox
    • one year ago
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    42%

  91. jim_thompson5910
    • one year ago
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    yes

  92. bobobox
    • one year ago
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    is it A?!?!?!?! eeeeeeeeeee

  93. jim_thompson5910
    • one year ago
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    yeah

  94. jim_thompson5910
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    that's assuming my interpretation was correct

  95. bobobox
    • one year ago
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    okay next one lol so srry but I am learning a ton

  96. bobobox
    • one year ago
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  97. bobobox
    • one year ago
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    that was the question and options

  98. jim_thompson5910
    • one year ago
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    your thoughts?

  99. bobobox
    • one year ago
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    no clue I need to learn that fancy vocabulary

  100. jim_thompson5910
    • one year ago
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    so all of the terms are unfamiliar?

  101. bobobox
    • one year ago
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    yes

  102. bobobox
    • one year ago
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    if you tell me what each word means I might be able to make an educated guess

  103. jim_thompson5910
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    Ok let's make up an example

  104. jim_thompson5910
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    Let's say we have males and females and let's say we want to know if they like coke or pepsi I'm just going to randomly make up data Males: 12 like coke, 10 like pepsi Females 8 like coke, 13 like pepsi

  105. bobobox
    • one year ago
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    okay I get that so far

  106. jim_thompson5910
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    |dw:1435452321297:dw|

  107. jim_thompson5910
    • one year ago
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    go ahead and fill out the table (click the pencil to draw on my drawing)

  108. bobobox
    • one year ago
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    |dw:1435452206385:dw|

  109. jim_thompson5910
    • one year ago
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    the 86 is incorrect, but everything else looks good

  110. bobobox
    • one year ago
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    |dw:1435452344153:dw|

  111. jim_thompson5910
    • one year ago
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    better

  112. jim_thompson5910
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    you only add either the row totals OR the column totals (pick one)

  113. jim_thompson5910
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    the numbers I'm circling are called `joint frequencies` |dw:1435452635430:dw|

  114. bobobox
    • one year ago
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    okay

  115. jim_thompson5910
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    they are frequencies (whole numbers, counts of something) the "joint" means the frequencies represent 2 different things. For instance, the 12 represents "male" and "coke" at the same time think of "joint" as in "joint bank account" (2 or more people own/access it) or as in "joints in your body" (connecting 2 bones together)

  116. bobobox
    • one year ago
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    okay joints=2+

  117. jim_thompson5910
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    now if you divide every value by the total number of people (43), you will get this |dw:1435452804260:dw|

  118. bobobox
    • one year ago
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    okay i see how you got that

  119. jim_thompson5910
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    these circled values are called `joint relative frequencies` |dw:1435453025373:dw| they are basically `joint frequencies` but divided by the total (in this case 43)

  120. jim_thompson5910
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    for example, 0.28 is a `joint relative frequency` it means "28% of the entire group is male and likes coke"

  121. bobobox
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    okay

  122. jim_thompson5910
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    notice how 43*.28 = 12.04 which is pretty close to the original 12

  123. bobobox
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    yeah you just rounded

  124. jim_thompson5910
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    ok more terms

  125. bobobox
    • one year ago
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    okay throw them at me

  126. jim_thompson5910
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    these are marginal frequencies |dw:1435453144401:dw|

  127. jim_thompson5910
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    they are in the margins (off to the side, think margins on a paper) and they are frequencies (whole number counts)

  128. bobobox
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    wait does frequency=whole number counts=?

  129. jim_thompson5910
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    frequency is just a fancy way of saying how many times it happens

  130. jim_thompson5910
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    so yeah it's a count of something

  131. bobobox
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    okay sorry continue

  132. jim_thompson5910
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    marginal relative frequencies are basically the same as joint relative frequencies just now you focus on the margins |dw:1435453312087:dw|

  133. bobobox
    • one year ago
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    okay @jim_thompson5910 sorry if I am a little spotty dont worry I am still here

  134. jim_thompson5910
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    its fine

  135. bobobox
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    okay

  136. bobobox
    • one year ago
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    @jim_thompson5910

  137. jim_thompson5910
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    yes?

  138. bobobox
    • one year ago
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    so I m thinking of the answer to the actual question now

  139. jim_thompson5910
    • one year ago
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    what are you thinking so far

  140. bobobox
    • one year ago
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    wait relative=?

  141. jim_thompson5910
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    it means a piece of, or percentage of

  142. jim_thompson5910
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    it's like a proportion

  143. bobobox
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    okay I am making an educated guess here.. is it B? since its a decimal

  144. jim_thompson5910
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    and why is it not D?

  145. bobobox
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    hmmm... I think it's B becuase it represents two things, female students and dancing, but then again it could be marginal

  146. jim_thompson5910
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    is that value in the margins?

  147. bobobox
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    no

  148. bobobox
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    the colum next to it is the total value of the margin

  149. jim_thompson5910
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    so it can't be a marginal relative frequency

  150. bobobox
    • one year ago
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    okay so my educated guess was right!

  151. jim_thompson5910
    • one year ago
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    yes

  152. bobobox
    • one year ago
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    here is the next one you are really helping me

  153. bobobox
    • one year ago
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    @jim_thompson5910

  154. jim_thompson5910
    • one year ago
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    post in a new question. I'm lagging really badly since there's so much on this post

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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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