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##### Penn State STAT 200 Quiz 2014

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solution

**Question**

?. B) statistically significant because the p-value >?. C) not practically significant because the p-value >?. D) not statistically significant because the p-value >?.2.Suppose a 95% confidence interval for p, the proportion of drivers who admit that they sometimes run red lights when no one is around, is 0.29 to 0.38. Which of the following statements is false? A) A test of Ho:? = 0.3 versus Ha:?? 0.3 would not be rejected using a = 0.05. B) It is plausible that a majority of all drivers would admit that they sometimes run red lights when no one is around. C) A test of Ho:? = 0.5 versus Ha:?? 0.5 would be rejected using a = 0.05. D) It is plausible that about 37% of all drivers would admit that they sometimes run red lights when no one is around.3.The primary purpose of a significance test is to A) estimate the p-value of a sample. B) decide whether there is enough evidence to support a research hypothesis, Ha, about a population. C) decide whether there is enough evidence to support a research hypothesis, Ha, about a sample. D) estimate the p-value of a population.4.The primary purpose of a significance test is to A) decide whether there is enough evidence to support a research hypothesis, Ha, about a sample. B) decide whether there is enough evidence to support a research hypothesis, Ha, about a population. C) estimate the p-value of a sample. D) estimate the p-value of a population.5.The p-value for a one-sided test for a mean was 0.04. The p-value for the corresponding two-sided test would be: A) 0.04 B) 0.02 C) 0.08 D) 0.066.A researcher wants to assess if there is a difference in the average age of onset of a certain disease for men and women who get the disease. Let?1 = average age of onset for women and?2 = average age of onset for men. A random sample of 30 women with the disease showed an average age of onset of 83 years, with a sample standard deviation of 11.5 years. A random sample of 20 men with the disease showed an average age of onset of 77 years, with a sample standard deviation of 4.5 years. Assume that ages at onset of this disease are normally distributed for each gender, do not assume the population variances are equal. What are the appropriate null and alternative hypotheses? A)?1 =?2 and Ha:?1 >?2 B)?1 =?2 and Ha:?1??2 C)?1??2 and Ha:?1 =?2 D)?1 =?2 and Ha:?1

Paper#61971 | Written in 18-Jul-2015

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