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A sample of 25 measurements is: 7 5 6 9 6 10 11 7 8 7 9 7 11 7 9 9 10 12 8

A sample of 25 measurements is:

7

5

6

9

6

10

11

7

8

7

9

7

11

7

9

9

10

12

8

10

7

10

7

8

6

a. Compute , s2 and s for this sample.

Answer: ________________s2_______________ s__________________

Count the number of observations in the intervals , 2, 3 . Express each count as a percentage of the total number of measurements.

Compare the percentages found in part b to the percentages given by the Empirical Rule and Chebyshev's Rule.

d. Calculate the range and use it to obtain a rough approximation for . Does the result compare favorably with the actual value for found in part a.

.

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