Answer Happy

7) See problems 2-6 above. Did you prove the population standard deviation of "Diet A' to be 6.07 a) In failing to reject that it is 6.0, it makes me think it probably is pretty close to 6.0. b) I rejected the claim, which proves the pop standard deviation is 6.0. c) In failing to reject that it is 6.0, it makes me think it is probably not very close to 6.0. d) In rejecting the claim that it is 6.0, I proved it is not 6.0. 8) See problems 2-6 above. Which diet is better, A or B? of Diet B a) By virtue of a lower pop standard deviation, A would be better. b) By virtue of a lower pop standard deviation, B would be better. c) My evidence really did not address this question very well. d) A comparable standard deviation means both diets are equally bad; besides everyone knows that fat guys are jolly,

2) See problem #1. Find the critical value. a) 1.75 b)-2.05 c)-1.75 Z =/inverse norm (0.04)| 0.04 3) See problem #1. Calculate the test statistic. a) - 1.41 b) 1.75 c) 2.05 d) 2.05 d) 1.41

4) See problem #1. Calculate the pvalue. P(Z >1,41) a) 0.2195 b) 0.0789 0.0790 5) See problem #1. Calculate the appropriate confidence interval. a) (18.3%, 25.6%) b)(19.0%, 24.9%) c) (19.2%, 24.7%) d) 0.2000 d) (19.6%, 24.3%) 6) See problem # 1. State the technical conclusion based on the traditional method. a) The test statistic is closer to zero than is the critical value; I conclude Reject Ho. b) The test statistic is closer to zero than is the critical value; I conclude FTR Ho. c) The test statistic is further from zero than is the critical value; I conclude Reject Ho. d) The test statistic is further from zero than is the critical value; I conclude FTR Ho.

8-4 (Testing a Claim about a Standard Deviation or Variance) 1) Which TI-83+ or TI-84+ automatic calculator function will you use in this section? 2 a) 1-PropZTest b) T-Test c)X²-Test d) None of these. 2) When a SRS of 40 people used 'Diet A' for one year, their weight losses had standard deviation 4.9 lbs. Use a 0.01 significance level to test the claim that the population standard deviation of all users of 'Diet A' is 6.0, which is the population standard deviation of users of 'Diet B'. State the null and alternative hypotheses. a) d) None of the above choices is true. I did not prove anything. Ho: ≤ 6.0 Ha: o> 6.0 3) See problem 2. State the critical value(s). a) ±63.691 4) See prohlor Ho: a = 6.0 Ha: o # 6.0 b) 22.164, 63.191 Ho: 26.0 Ha: 0 < 6.0 c) 20.707, 66.766 Ho:o # 6.0 d) Ha: o = 6.0 d) 22.164