Question

e results are shown below (in minutes). use the data to answer the questions.
jessicas sample:
9, 19, 5, 8, 7, 11, 20

anns sample:
5, 13, 12, 17, 18, 15

(a) what is the sample size for jessicas sample?

(b) what is the sample size for anns sample?

(c) suppose you had to choose one sample to estimate the mean.
which sample is more likely to give a good estimate of the mean?
jessicas sample anns sample

why?

Explanation:

Part (a)

Step1: Identify Jessica's data points

Jessica's sample: 9, 19, 5, 8, 7, 11, 20. Count the number of values.
There are 7 values.

Step1: Identify Ann's data points

Ann's sample: 5, 13, 12, 17, 18, 15. Count the number of values.
There are 6 values.

To estimate the mean, a larger sample size generally gives a better estimate (less sampling error). Jessica's sample size is 7, Ann's is 6. So Jessica's sample, with a larger size, is more likely to give a good estimate.

Answer:

7

Part (b)