A nurse was interested in discovering whether men have more variability in their systolic blood pressure than women. She randomly selects 20 males and 17 females from the surgical floor of her hospital and records their systolic blood pressures. The data are as follows:    

(a) Given the following normal probability plots, comment on whether the requirement of normality required for the F-test is satisfied and justify your answer.

(b) The nurse enters the data into MINITAB to determine whether males have a higher standard deviation of systolic blood pressure than females at the a = 0.05 level of significance. She obtains a P-value of 0.0844. What should the nurse conclude?

(c) Compute the test statistic, and use Table VIII to verify that the P-value computed is correct.

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Males Females 126 106 112 134 124 118 112 140 106 140 126 134 132 105 128 126 136 140 122 110 124 95 120 148 120 126 140 114 118 130 118 130 150 112 116 142 128 140 Probability Plot of Female Normal - 95% CI 99 Maan 125.2 ADev 10.35 95 17 AD 0.220 90 P-Value 0.775 70 hll 50 40 30 20 90 100 110 120 Temale 130 140 150 160 Percent