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Mathematics, 07.03.2020 04:37 Laylahlettiere
A sporting goods store believes the average age of its customers is 38 or less. A random sample of 40 customers wasâ surveyed, and the average customer age was found to be 41.6 years. Assume the standard deviation for customer age is 8.0 years. Using alphaequals0.05â, complete parts a and b below. a. Does the sample provide enough evidence to refute the age claim made by the sporting goodsâ store? Determine the null and alternative hypotheses. Upper H 0â: mu less than or equals 38 Upper H 1â: mu greater than 38 Theâ z-test statistic is 2.85. â(Round to two decimal places asâ needed.) The criticalâ z-score(s) is(are) 1.64. â(Round to two decimal places as needed. Use a comma to separate answers asâ needed.) Because the test statistic is greater than the critical value, reject the null hypothesis. b. Determine theâ p-value for this test. Theâ p-value is . 998. â(Round to three decimal places asâ needed.)
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A sporting goods store believes the average age of its customers is 38 or less. A random sample of 4...
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