anonymous
  • 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
Mathematics
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SOLVED
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chestercat
  • chestercat
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anonymous
  • 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
  • anonymous
@welshfella
kropot72
  • kropot72
Can you see any outliers in the data for the second period?

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anonymous
  • anonymous
wait
anonymous
  • anonymous
Yes 0
anonymous
  • anonymous
0 is an outliner in second period
kropot72
  • kropot72
I don't think that zero is an outlier. It is not far removed from the other values in the set.
anonymous
  • 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
  • kropot72
An example of an outlier is 9 in the first period.
anonymous
  • anonymous
Outliner - A value that "lies outside" (is much smaller or larger than) most of the other values in a set of data.
anonymous
  • anonymous
The outliner is 8 in 3rd period
kropot72
  • 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
  • anonymous
Sure why not
anonymous
  • anonymous
There are no Outliners in Second Period.... are there?
kropot72
  • 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
  • anonymous
Its a measurment done from the mean
anonymous
  • anonymous
that is what a stander mediation is
kropot72
  • 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
  • anonymous
yes its A
anonymous
  • anonymous
Thank you very much Kropot
kropot72
  • kropot72
You're welcome :)

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