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KitKat16
 one year ago
HELP!!!
The box plots below show attendance at a local movie theater and high school basketball games.
Which of the following best describes how to measure the spread of the data?
KitKat16
 one year ago
HELP!!! The box plots below show attendance at a local movie theater and high school basketball games. Which of the following best describes how to measure the spread of the data?

This Question is Closed

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0A: The IQR is a better measure of spread for movies than it is for basketball games. B: The standard deviation is a better measure of spread for movies than it is for basketball games. C: The IQR is the best measurement of spread for games and movies. D: The standard deviation is the best measurement of spread for games and movies. I know it can't be A or D

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0I think it is B because it has a bigger spread.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The problem with the standard deviation in this case is that there is no way to calculate it  we don't have the mean in this problem, so it is not possible to do the calculation without more information.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i think The standard deviation is the best measurement of spread for games and movies.

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0So IQR? Is that called a H spread? What is the H do you know?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Nurali How would we know this without knowing the mean or standard deviation?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@KitKat16 Hspread is the same as the IQR, but I'm not sure what it stands for. Let me hunt a little.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0H seems to stand for "hinge," because Q3 is sometimes referred to as the "upperhinge" and Q1 is the "lower hinge." The difference Q3Q1 is the spread between them, hence "Hspread"

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0Oh thank you Ive been trying to figure that out

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0So in order to know this answer we would need to know mean or standard deviation?

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0@Nurali I know that D is wrong

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0So I thought it had to be : The standard deviation is a better measure of spread for movies than it is for basketball games

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0@ganeshie8 can you look at this for me please?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I think we have to assume that this is all the information we are given. In which case, it wouldn't make sense to choose the options with standard deviation because we know nothing about them. I believe that C must be the correct answer because there isn't really an alternative (unless there is some information I'm missing).

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0Is the width of the box indicative of smaller standard deviation. (I never did these before so i'm no expert!) Just a thought

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0I thought the box was to show the quadrants

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0Do the 2 ends of the box give the upper and lower quartiles?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0 if so then the IQR for movies is less that that for games.

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0spacings between the different parts of the box indicate the degree of dispersion (spread) and skewness in the data, and show outliers.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@welshfella The two ends of the box do give the measure of spread, but based on the median rather than the mean Since we know nothing about the mean or standard deviation, the only measure of spread we have is this boxandwhisker plot

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0the line in the box is the median right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Plus, the standard deviation is also strongly swayed by outliers  it seems as though there might be some in this data set

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0So this would mean standard deviation is out all together and it would have to be The IQR is the best measurement of spread for games and movies.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Which means the standard deviation also would not be as good as the IQR

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I would say that C is a better answer, mostly because there is no reason to reject the IQR based on the information given

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0They are both skewed data sets, which makes them better candidates for the IQR than standard deviation

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I suppose you could draw that conclusion about the standard deviation

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The standard deviation is mostly used in situations that look relatively unskewed

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0In the last paragraph, this article makes the same point about skewed data: https://epilab.ich.ucl.ac.uk/coursematerial/statistics/summarising_centre_spread/measures_spread/comparing%20measures%20of%20spread.html And about 60% of the way down on this one http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3198538/

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0Thanks so much guys! I wish when I got something wrong the teacher would explain why. This stuff is too confusing.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0https://www.youtube.com/watch?v=2v8T96dnmGk this should help

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0Note that the data is more skewed for the movies than the games.

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0That was awesome @welshfella still confused on the IQR explanation on being less consistant. will watch some more. Thanks again

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0yw  well if you look at our data the movie data is more consistent than the games data.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0I'm not convinced that C is the correct answer. But you said you knew it was'nt A?

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0That would make the answer A even though you could measure both best with the IQR

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0Thats just what I was thinking

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0I know but you know sometimes these questions are faulty

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0Yea  I'd love to see what the answer is. Its a long time since I did this stuff thats why I@m so hazy about it.

KitKat16
 one year ago
Best ResponseYou've already chosen the best response.0If I find Out I will let you know and post it here
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