11 The z value for a 97.8% confidence interval estimation is _____. Group of answer choices 1.96 2.02 2.00 2.29 Flag question: Question 12 The practice of concluding "do not reject H0" is preferred over "accept H0" when we _____. Group of answer choices are testing the validity of a claim have not controlled for the Type II error are conducting a one-tailed test have an insufficient sample size Flag question: Question 13 Which of the following is an improper form of the null and alternative hypotheses? Group of answer choices and and and and Flag question: Question 14 Your investment executive claims that the average yearly rate of return on the stocks she recommends is at least 10.0%. You plan on taking a sample to test her claim. The correct set of hypotheses is _____. Group of answer choices H0: 10.0% Ha: < 10.0% H0: < 10.0% Ha: 10.0% H0: > 10.0% Ha: 10.0% H0: 10.0% Ha: > 10.0% Flag question: Question 15 A student believes that the average grade on the final examination in statistics is at least 85. She plans on taking a sample to test her belief. The correct set of hypotheses is _____. Group of answer choices H0: 85 Ha: < 85 H0: < 85 Ha: 85 H0: > 85 Ha: 85 H0: 85 Ha: > 85 Flag question: Question 16 The manager of an automobile dealership is considering a new bonus plan in order to increase sales. Currently, the mean sales rate per salesperson is five automobiles per month. The correct set of hypotheses for testing the effect of the bonus plan is _____. Group of answer choices H0: 5 Ha: > 5 H0: < 5 Ha: 5 H0: 5 Ha: < 5 H0: > 5 Ha: 5 Flag question: Question 17 In hypothesis testing, if the null hypothesis has been rejected when the alternative hypothesis has been true, _____. Group of answer choices a Type II error has been committed the correct decision has been made the sample size is too small a Type I error has been committed Flag question: Question 18 A two-tailed test at a .0694 level of significance has z values of _____. Group of answer choices -1.09 and 1.09 -1.96 and 1.96 -1.48 and 1.48 -.86 and .86 Flag question: Question 19 A one-tailed test (upper tail) at a .123 level of significance has a z value of _____. Group of answer choices 1.16 1.96 1.54 1.645 Flag question: Question 20 A two-tailed test is performed at a 5% level of significance. The p-value is determined to be .09. The null hypothesis _____. Group of answer choices has been designed incorrectly should not be rejected may or may not be rejected, depending on the sample size must be rejected