Principle 1: A value not in the confidence interval can be rejected as a possible value of the population parameter. A value in the confidence interval is an "acceptable" possibility for the value of a population parameter.

Principle 2: When the confidence intervals in two different populations do not overlap, it is reasonable to conclude that the two populations are different.

1. Exercise Gear. A company sells exercise clothing and equipment on the Internet. To design clothing, data on physical characteristics of different types of customers is collected. The weight, in kilograms, of 24 female randomly selected runners are recorded:

62.8	56.9	58	48.1	57.3	54.7	50.4	53.9
55.9	64.2	58.7	63.3	59.7	60.6	51	52.8
61	57.9	48.6	60	50.8	55.4	64.3	56.7

a. Give the 95% confidence interval for the mean weight of the population of all female runners.

b. Based on this confidence interval, does a test of

H₀:

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