STATSW16

1)Suppose you needed to form a 92% confidence interval for a population mean. What z value would you use? 6)Find the critical value for a right-tailed test with a=0.01 and n=75 A. 1.96 A. 1.65 B. 1.75 B. 2.33 C. .82 C. 1.96 D. 1.41 D. 2.58 2)Which of the following is a way to INCREASE the width of a confidence interval? 7)Find the critical value for a left-tailed test with a=0.05 and n=75 A. decrease the error A. -1.65 B. increase the sample size B. 1.65 C. increase the confidence level C. 2.33 D. increase the chance for error D. -2.33 3)A simple random sample of 25 is drawn from a population that is normally distributed. The sample mean is found to be 108 with a sample standard deviation, s is 10 ( population standard deviation is unknown). Construct the 95% 8)Find the critical value for a two-tailed test with a=0.10 and n = 100 confidence interval. A 12.33 A 103.87-112.13 B. +2.58 B. 3.92 C. $1.96 C. 4.13 D. $1.65 D. 104.08 - 111.92 9)You wish to test the claim that >12 at a level of significance of a=0.05 and are given the sample statistics mean = 4)A survey of 2070 golfers showed that 347 of them are left-handed. What sample proportion would be used to find a 12.3, deviation = 1.2, and sample size = 50. Compute the value of the standardized test statistic. confidence interval for the population proportion? A. 3.11 A. 832 B. 2.31 B. 210 C. 1.77 C. .144 D. 0.98 D. .168 10)Suppose you want to test the claim that u>25.6. Given a sample size of n=42 and a level of significance of a=0.025, 5)The mean age of bus drivers in Chicago is 50.1 years. If a hypothesis test is performed, how should you interpret a when should you reject the null hypothesis? decision that rejects the null hypothesis? A. if the standardized test statistic is greater than 1.65 A. There is not sufficient evidence to reject the claim that =50.1 B. if the standardized test statistic is greater than 1.96 B. There is not sufficient evidence to support the claim that u=50.1 C. if the standardized test statistic is greater than 1.28 C. There is sufficient evidence to support the claim that u=50.1 D. if the standardized test statistic is greater than 2.33 D. There is sufficient evidence to reject the claim that =50.1