All you need to do is explain how to solve each using the TI-84 Plus (You can download a free 90 day version online for your PC).

Correct Answers:

82) A, 83) B, 84) B, 85) B, 86) A, 87) A, 88) C, 89) A, 90) A

82)A test of H^0: u = 52 versus H^1 : u < 52 is performed using a significance level of a = 0.01. The P-value is 0.073. Is H^0 rejected?

A) No

B) Yes

C) It cannot be determined.

83) A test is made of H^0: u = 63 versus H^1 : u > 63. A sample of size n = 74 is drawn, and x = 61. The population standard deviation is o = 29. Compute the value of the test statistic z. A) 0.28

B) -0.59

C) -0.07

D) -3.19

84)A test of H^0: u = 55 versus H^1: u 55 is performed using a significance level of a = 0.01. The P-value is 0.139. Is H^0 rejected?

A) It cannot be determined. B) No C) Yes

85)A test of H^0: u = 64 versus H1^: u 64 is performed using a significance level of a = 0.01. The value of the test statistic is z = -2.45. Is H^0 rejected?

A) It cannot be determined. B) No C) Yes

86) A market research firm reported that the mean annual earnings of all family practitioners in the United States was $179,920. A random sample of 36 family practitioners in New York that month had mean earnings of x = $197,064 with a standard deviation of $35,478. You wish to test whether family practitioners in New York make more than the national average.

State a conclusion regarding H^0. Use the a = 0.1 level of significance.

A) Reject H^0: the mean annual earnings appear to be greater than the national average.

B)Do not reject H^0 : there is insufficient evidence to conclude that the mean annual earnings are greater than the national average.

C) There is not enough information to draw a conclusion.

87) The mean annual tuition and fees for a sample of 14 private colleges was $38,100 with a standard deviation of $6000 A dotplot shows that it is reasonable to assume that the population is approximately normal. You wish to test whether the mean tuition and fees for private colleges is different from $33,900. State a conclusion regarding H^0. Use the a = 0.01 level of significance.

A) Do not reject H^0. There is insufficient evidence to conclude that the mean annual tuition and fees is different from $33,900.

B) There is not enough information to draw a conclusion.

C) Reject H^0. The mean annual tuition and fees appears to be different from $33,900. 88) In a simple random sample of size 77, there were 20 individuals in the category of interest. Compute the sample proportion p. A) 97 B) 0.351 C) 0.260 D) 0.740

89) In a simple random sample of size 64, there were 32 individuals in the category of interest. It is desired to test H^0: p = 0.36 versus H^1: p < 0.36. Do you reject H^0 at the 0.05 level?

A) No B) Yes

90) A poll surveyed 774 video gamers, and 209 of them said they prefer playing games on a console rather than a computer. An executive at a game console company claims that more than 25% of gamers prefer consoles. Does the poll provide convincing evidence that the claim is true? Use the a = 0.05 level of significance.

A) No B) No conclusion is possible. C) Yes