Lab 8 (Hypothesis Testing) Lab 8 (Hypothesis Testing) 1. If the sample data are in the critical region with a = .01, then the same sample data would still be in the critical region if a were changed to .05. 6. Which of the following accurately describes a hypothesis test? a. True a. A descriptive technique that allows researchers to describe a sample b. False b. A descriptive technique that allows researchers to describe a population c. An inferential technique that uses the data from a sample to draw inferences about a population 2. If a hypothesis test produces a z-score in the critical region, what decision should be made? d. An inferential technique that uses information about a population to make predictions a. Reject the alternative hypothesis about a sample b. Fail to reject the alternative hypothesis c. Reject the null hypothesis 7. A researcher selects a sample and administers a treatment to the individuals in the sample. If the sample is used for a hypothesis test, what does the alternative hypothesis (Hi) say about the d. Fail to reject the null hypothesis treatment ? a. The treatment causes a change in the scores. 3. The critical boundaries for a hypothesis test are z = +1.96 and -1.96. If the z-score for the b . The treatment adds a constant to each score. sample data is z = -1.90, what is the correct statistical decision? c . The treatment multiplies each score by a constant. a. Fail to reject Hi d. The treatment has no effect on the scores. b. Fail to reject Ho c. Reject Hi 8. A researcher administers a treatment to a sample of participants selected from a population d. Reject Ho with u = 80. If the researcher obtains a sample mean of M = 88, which combination of factors is most likely to result in rejecting the null hypothesis? a. o = 5 and n = 25 4. The critical boundaries for a hypothesis test are z = +1.96 and -1.96. If the z-score for the sample data is z = -1.86, what is the correct statistical decision? b. o = 5 and n = 50 a. Fail to reject Hi c. = 10 and n = 25 b. Fail to reject Ho d. o = 10 and n = 50 c. Reject Hi d. Reject Ho 9. You complete a hypothesis test using ! =.05, and based on the evidence from the sample. your decision is to reject the null hypothesis. If the treatment actually has no effect, which of the following is true? a. You have made a Type I error. 5. Which of the following accurately describes the critical region? b. You have made a Type II error. a. Outcomes with a very low probability if the null hypothesis is true c. You might have made a Type I error, but the probability is only 5% at most. b. Outcomes with a high probability if the null hypothesis is true d. You have made the correct decision. c. Outcomes with a very low probability whether or not the null hypothesis is true d. Outcomes with a high probability whether or not the null hypothesis is true 10. You complete a hypothesis test using = 05, and based on the evidence from the sample, your decision is to fail to reject the null hypothesis. If the treatment actually does have an effect. which of the following is true? a. You have made a Type I error. b. You have made a Type II error. c. You might have made a Type I error, but the probability is only 5% at most. d. You have made the correct decision
