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anonymous

  • one year ago

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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  1. anonymous
    • one year ago
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    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

  2. anonymous
    • one year ago
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    @welshfella

  3. kropot72
    • one year ago
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    Can you see any outliers in the data for the second period?

  4. anonymous
    • one year ago
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    wait

  5. anonymous
    • one year ago
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    Yes 0

  6. anonymous
    • one year ago
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    0 is an outliner in second period

  7. kropot72
    • one year ago
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    I don't think that zero is an outlier. It is not far removed from the other values in the set.

  8. anonymous
    • one year ago
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    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.

  9. kropot72
    • one year ago
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    An example of an outlier is 9 in the first period.

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

  11. anonymous
    • one year ago
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    The outliner is 8 in 3rd period

  12. kropot72
    • one year ago
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    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?

  13. anonymous
    • one year ago
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    Sure why not

  14. anonymous
    • one year ago
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    There are no Outliners in Second Period.... are there?

  15. kropot72
    • one year ago
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    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?

  16. anonymous
    • one year ago
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    Its a measurment done from the mean

  17. anonymous
    • one year ago
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    that is what a stander mediation is

  18. kropot72
    • one year ago
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    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?

  19. anonymous
    • one year ago
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    yes its A

  20. anonymous
    • one year ago
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    Thank you very much Kropot

  21. kropot72
    • one year ago
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    You're welcome :)

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