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January 25, 2015

January 25, 2015

Posted by **tim** on Sunday, February 26, 2012 at 9:19pm.

determine how many of them had their homework done before class. The following arc

the results of the weekly polls:

Week # # of students with homework done

1 1

2 8

3 12

4 14

5 22

6 30

7 25

8 8

a. Calculate the median.

b. Calculate the standard deviation.

- stats -
**PsyDAG**, Tuesday, February 28, 2012 at 12:34ama. Median is the 50th percentile.

b. Find the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

I'll let you do the calculations.

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