HELP TO MAKE SURE WORK IS CORRECT PLEASE!!!

- help_people

HELP TO MAKE SURE WORK IS CORRECT PLEASE!!!

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- schrodinger

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- help_people

An equation was used to predict possible sales of phones for 6 months. The actual sales of phones are also listed.
Actual sales 55 150 325 510 780 990
Predicted sales 40 150 300 500 800 1,000
The sum of the residuals is ______.
Numerical Answers Expected!
Answer for Blank 1:

- help_people

20 is what i put for sum

- freckles

So residual I think is the difference between the actual and the predicted right?

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## More answers

- help_people

yes ma'am and then they are asking for the sum after you do each one :)

- freckles

well then I believe that answer will be given by this then
\[(55+150+325+510+780+990)-(40+150+300+500+800+1000)\]

- freckles

which does come out to be 20

- help_people

thats now how i did it

- help_people

i subtracted each actual sale and predicted then found the answer to them and added them all together :)

- freckles

that is the same thing

- freckles

just written differently
remember addition is commutative

- help_people

ok may you make sure another is correct?

- help_people

or a couple? :D

- freckles

maybe

- freckles

is it something about residuals or whatever?

- help_people

no

- help_people

algebra still lol

- help_people

can you still help????

- freckles

I'm waiting
I said I might be able to help

- freckles

I have to get a look of the warlock before I know
Iike residuals was kind of a new term for me

- help_people

ok

- help_people

The following data show the scores Gina obtained on 12 IQ tests:
93, 83, 74, 74, 83, 92, 93, 94, 90, 87, 83, 86
The box plot below represents the data:
box plot has minimum value equal to 74, lower quartile equal to 83, median equal to 86.5, upper quartile equal to 89 and maximum value equal to 94
Which of the following is shown incorrectly in the box plot?
Median
Lower quartile
Upper quartile
Maximum value

- help_people

##### 1 Attachment

- freckles

well looking at the data have you tried to find the information yet?

- freckles

like first thing is to order the data from least to greatest

- help_people

i think its c

- freckles

I like to use a stem leaf chart to organize my data

- help_people

ok what is that?

- freckles

|dw:1435971696968:dw|

- freckles

we see from the chart 74 is indeed the min
and 94 is the max

- freckles

|dw:1435971803890:dw|

- help_people

yeah

- freckles

the median is the number in the middle of the data
we have an even amount amount of data points
so we will need to look at the two middle numbers
and find the average of two middle numbers to find the median

- freckles

so what two numbers are in the middle of all that junk there

- freckles

I will give a hint look at
12/2 and (12/2)+1 entries
that is looked at the 6th and 7th entry

- help_people

2 and 3?

- freckles

|dw:1435972025373:dw|
1st entry=74
2nd entry=74
3rd entry=83
4th entry=83
5th entry=83
6th entry=86
7th entry=87
8th entry=90
9th entry=92
10th entry=93
11th entry=93
12th entry=94

- freckles

|dw:1435972118924:dw|
to find the median we need to find the average of 86 and 87

- help_people

ok

- help_people

how do you do that again?

- freckles

the average of n numbers is the sum of those n numbers divided by the number of numbers n

- help_people

? can u show me?

- freckles

that is to find the average of two numbers, 86 and 87
you add them and divide by the number of numbers, 2

- freckles

are you good with the median?

- freckles

do you need help adding 86 and 87
and dividing that result by 2?

- freckles

I will give you a hint
what number is midway between 86 and 87

- freckles

if you don't know then just do (86+87)/2

- freckles

anyways after we find the median we will find the "median" of the upper data
and find the "median" of the lower data
I put median in quotation marks since we are actually finding the upper quartile and lower quartile number respectively

- help_people

86.5

- freckles

right this is correctly shown as the median on the graph

- freckles

so moving on to upper quartile number

- freckles

the median split the data up in two halves

- freckles

we want to find the middle number in each

- freckles

90,92,93,93,94
what number is the middle number here

- help_people

93

- freckles

right that number is the upper quartile number
and yes 93 is in the middle there because you have exactly two entries to the right and left of it
and we can end the discussion here since that is not shown in the graph correctly
we need to spot the middle number in the lower data points
74,74,83,83,83
83 is the lower quartile number since it is the middle number of the lower points
you have exactly two entries to right and left of it
that is shown correctly in the graph

- help_people

ok

- freckles

|dw:1435972933122:dw|
the graph should have looked something like this

- freckles

badly drawn but I the marks above and the box you see is lying at the correct numbers

- help_people

ok so the answer is c? "upper quartile"

- help_people

@freckles ^

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