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- anonymous

A survey was taken of students in math classes to find out how many hours per day students spend on social media. The survey results for the first-, second-, and third-period classes are as follows:
First period: 2, 4, 3, 1, 0, 2, 1, 3, 1, 4, 9, 2, 4, 3, 0
Second period: 3, 2, 3, 1, 3, 4, 2, 4, 3, 1, 0, 2, 3, 1, 2
Third period: 4, 5, 3, 4, 2, 3, 4, 1, 8, 2, 3, 1, 0, 2, 1, 3

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- anonymous

- katieb

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- anonymous

Which is the best measure of center for second period and why?
Mean, because there are no outliers that affect the center
Median, because there is 1 outlier that affects the center
Interquartile range, because there is 1 outlier that affects the center
Standard deviation, because there are no outliers that affect the center

- anonymous

- kropot72

Can you see any outliers in the data for the second period?

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- anonymous

wait

- anonymous

Yes 0

- anonymous

0 is an outliner in second period

- kropot72

I don't think that zero is an outlier. It is not far removed from the other values in the set.

- anonymous

But its the least common and it has the least ammount from the data set not to mention its the furthest from all the numbers.

- kropot72

An example of an outlier is 9 in the first period.

- anonymous

Outliner - A value that "lies outside" (is much smaller or larger than) most of the other values in a set of data.

- anonymous

The outliner is 8 in 3rd period

- kropot72

There are accepted ways to decide whether or not a point should be regarded as an outlier.
A point is an outlier if:
1) It is more than two standard deviations away from the mean
or
2) It is more than 1.5 times the inter-quartile range away from the nearest quartile.
Do you want to use one of these methods to decide whether or not 0 is an outlier in the data for the second period?

- anonymous

Sure why not

- anonymous

There are no Outliners in Second Period.... are there?

- kropot72

I believe that there are no outliers in the data for the second period. If you accept that, the choice of answer is between A and D. Is the standard deviation a measure of the center?

- anonymous

Its a measurment done from the mean

- anonymous

that is what a stander mediation is

- kropot72

Standard deviation is a measure of spread. It is not a measure of the center. Can you now see what is the correct choice of answer?

- anonymous

yes its A

- anonymous

Thank you very much Kropot

- kropot72

You're welcome :)

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