1- The normal distribution is used to test about a population mean for large samples if the population standard deviation is known. "Large" is usually defined as a) at least 10 b) at least 5% of the population size c) at least 30 d) at least 12 2- Consider the following null and alternative hypotheses. Ho: 7 7 67 Ha: 7 > 67 These hypotheses a) indicate a one-tailed test with a rejection area in the right tail b) indicate a one-tailed test with a rejection area in the left tail c) indicate a two-tailed test d) are established incorrectly 3- Consider the following null and alternative hypotheses. Ho: 2 = 67 Ha: 2 7 67 These hypotheses a) indicate a one-tailed test with a rejection area in the right tail b) indicate a one-tailed test with a rejection area in the left tail c) indicate a two-tailed test d) are established incorrectly 4- In a two-tailed hypothesis about a population mean with a sample size of 100, ] is known, and a= 0.05, the rejection region would be a) z> 1.64 b) z> 1.96 c) z 1.96 d) z 1.64 5- The zvalue associated with a two-sided 90% confidence interval is a) 1.28 b) 1.645 c) 1.96 d) 2.575 6- In performing hypothesis tests about the population mean, if the population standard deviation is not known, a ftest can be used to test the mean if a) n is small b) the sample is random c) the population mean is known d) the population is normally distributed 7- The p-value is a) the probability that the alternative hypothesis is true. b) the probability that the null hypothesis is true. c) the probability of a statistic being at most as extreme as the observed value when Ho is true. d) the probability of a statistic being at least as extreme as the observed value when Ho is true. 8- The numerical value of the coefficient of correlation must be a) between -1 and +1 b) between -1 and 0 c) between 0 and 1 d) between 0 and -1 9- For a certain data set the regression equation is y= 29 - 5x The correlation coefficient between y and X in this data set a) must be 0 b) is negative c) must be 1 d) is positive