Stats16 Essay Example | Topics and Well Written Essays - 1250 words

Stats16 - Essay interpreterAnswer True False gesture 5 If other factors are held constant, then increasing the try standard deviation will increase the resemblinglihood of turn awaying the zero surmisal. Answer True False head teacher 6 If all other factors are held constant, increasing the sample size from n = 25 to n = 100 will increase the power of a statistical test. Answer True False Question 7 By selecting a smaller alpha level, a police detective is ___. Answer a. attempting to make it easier to turn down H 0 b. better able to detect a interposition proceeding c. reducing the risk of exposure of a instance I error d. All of the above. Question 8 The searing boundaries for a hypothesis test are z = +1.96 and -1.96. If the z-score for the sample data is z = -1.90, then what is the correct statistical ending? Answer a. Fail to reject H 1. b. Fail to reject H 0. c. refuse H 1. d. Reject H 0. Question 9 Increasing the alpha level (for example, from ? = .01 to ? = .05) ____. Answer a. increases the probability of a Type I error b. increases the size of the critical region c. increases the probability that the sample will fall into the critical region d. All of the above Question 10 In a hypothesis test, an extreme z-score value, like z = +3 or z = +4, ____. Answer a. is probably in the critical region b. direction that you should probably reject the null hypothesis c. ... concluded that a treatment has no imprint when it rightfully does d. concluded that a treatment has an effect when it really has no effect Question 12 A Type I error means that a researcher has ____. Answer a. concluded that a treatment has an effect when it really does b. concluded that a treatment has no effect when it really has no effect c. concluded that a treatment has no effect when it really does d. concluded that a treatment has an effect when it really has no effect Question 13 A researcher risks a Type I error ____. Answer a. anytime H 0 is rejected b. a nytime H 1 is rejected c. anytime the decision is betray to reject H 0 d. All of the other options are correct. Question 14 A researcher conducts a hypothesis test to evaluate the effect of a treatment. The hypothesis test produces a z-score of z = ?2.60. Assuming that the researcher is using a two-tailed test, what is the correct statistical decision? Answer a. Reject the null hypothesis with ? = .05 but not with ? = .01. b. Reject the null hypothesis with either ? = .05 or ? = .01. c. Fail to reject the null hypothesis with either ? = .05 or ? = .01. d. cannot answer without additional information Question 15 A researcher uses a hypothesis test to evaluate H 0 ? = 80. Which combination of factors is most liable(predicate) to result in rejecting the null hypothesis? Answer a. M = 85 and ? = 10 b. M = 85 and ? = 20 c. M = 90 and ? = 10 d. M = 90 and ? = 20 Question 16 A researcher uses a hypothesis test to evaluate H 0 ? = 80. Which combination of factors is most in all proba bility to result in rejecting the null hypothesis? Answer a. M = 85 and n = 10 b. M = 85 and n = 20 c. M = 90 and n = 10 d. M = 90 and n = 20 Question 17 A researcher uses a hypothesis test to evaluate H 0 ?= 80. Which