Answer_Key_Quiz_8_Form_A - 1 hour A simple random sample of...

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STAT 250 Spring 2009 Quiz 8 Please put your answers in the spaces provided or circle the correct response. 1. A Researcher believes the mean number of hours of sleep Americans 15 years of age or older exceeds 8 hours. The mean amount of sleep per night for a sample of 25 Americans 15 years of age or older is 8.47 hours. The sample standard deviation is 1.2 hours. Test the Researchers claim at a 0.05 significance level. Assume the random sample of 25 Americans 15 years of age or older is from a normal population. a. H 0 : μ = 8 μ 8 b. H 1 : μ < 8 μ 8 μ 8 μ 8 c. Test Statistic = __ 1.96 ___(Round to two decimal places.) d. Reject Not Reject e. At a 0.05 significance level, there is ( sufficient insufficient) evidence to support the claim that the mean number of hours of sleep Americans 15 years of age or older exceeds 8 hours.

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2. A Researcher believes the mean amount of time spent eating or drinking each day differs from
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Unformatted text preview: 1 hour. A simple random sample of 35 Americans 15 years and older yielded a mean of 1.23 hours with a population standard deviation for the amount of time spent eating or drinking of 0.65 hours. Test the researchers claim at a 0.05 significance level. Assume the sample of 35 American 15 years and older is from a normal population a. H : μ = __ 1 ___ b. H 1 : μ __ 1 ____ c. Test Statistic = __ 2.09 ___(Round to two decimal places.) d. p-value = ___ 0.0366 __(Round to four decimal places.) e. At a 0.05 significance level, there is ( sufficient insufficient) evidence to support the claim that the mean amount of time spent eating or drinking each day differs from 1 hour....
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This note was uploaded on 02/14/2011 for the course STAT 250 taught by Professor Sims during the Spring '08 term at George Mason.

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Answer_Key_Quiz_8_Form_A - 1 hour A simple random sample of...

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