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Fall 2008 Exam 1 - questions and answers

# Fall 2008 Exam 1 - questions and answers - Stat 252 Exam 1...

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Stat 252 Exam 1 Rein Fall 2008 1) Identify each statement about independent samples T-tests and CIs as True or False. a. The higher the confidence level, the higher the margin of error. b. The higher the sample sizes, the higher the margin of error. c. The higher the standard deviations, the higher the margin of error. d. If a Confidence Interval for ߤ െ ߤ includes zero and if ݔ ҧ is larger than ݔ ҧ , a null hypothesis of equality would be rejected in favor of an alternative hypothesis of inequality. e. If a Confidence Interval for ߤ െ ߤ includes zero and if ݔ ҧ is larger than ݔ ҧ , a null hypothesis of equality would be rejected in favor of an alternative hypothesis that ߤ is larger than ߤ . f. If a Confidence Interval for the difference of means is 2.1±1.1, it should be interpreted in plain English as “We are 95% sure that ݔ ҧ െ ݔ ҧ is in the 1.0 to 3.2 range.” g. If a Confidence Interval for the difference of means is 2.1±1.1, doubling the sample size for each group would cut the margin of error approximately in half. 1a True 1b False 1c True 1d False 1e False 1f False 1g False

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