Stat Quiz 8A 1) A researcher suggests that male nurses earn more money than female nurses. A survey of 16 male and 20 female nurses reported the data below. Is there enough evidence, at Alpha = .01,...

Stat Quiz 8A 1) A researcher suggests that male nurses earn more money than female nurses. A survey of 16 male and 20 female nurses reported the data below. Is there enough evidence, at Alpha = .01, to support the claim that male nurses earn more money? 1 2 1 2 1 2 $23,750 $24,800 $250 $500 20 16 FEMALE MALE X X s s n n ? ? ? ? ? ? 2) A company reported that an insured woman’s average stay in the hospital for normal childbirth is 2.3 days, while an uninsured woman’s average stay is 1.9 days. Both samples were of 16 women and the standard deviation for each was 0.6. At Alpha = .


Stat Quiz 1B Stat Quiz 8A 1) A researcher suggests that male nurses earn more money than female nurses. A survey of 16 male and 20 female nurses reported the data below. Is there enough evidence, at Alpha = .01, to support the claim that male nurses earn more money? 1 2 1 2 1 2 $23,750 $24,800 $250 $500 20 16 FEMALE MALE X X s s n n       2) A company reported that an insured woman’s average stay in the hospital for normal childbirth is 2.3 days, while an uninsured woman’s average stay is 1.9 days. Both samples were of 16 women and the standard deviation for each was 0.6. At Alpha = .01, test the claim that the means are equal. Then calculate the 99% confidence interval for the difference of the means. Stat Quiz 1B Stat Quiz 8B 1) A basketball coach claims that by taking a “special” vitamin, a weight lifter can increase his strength. Eight players are selected and given a test of strength. After two weeks of training , supplemented by the vitamin, they are tested again. Test the effectiveness of the vitamin at Alpha = .05. 1 2 1 2 3 4 5 6 7 8 ( ) 210 230 182 205 262 253 219 216 ( ) 219 236 179 204 270 250 222 216 Athlete Before X After X 2) Find the 90% confidence interval for the data above. 3) In a sample of 200 Dr’s, 15% thought that the government should control health care. In a sample of 200 nurses, 21% felt the same way. At Alpha = .01, is there a difference in the proportions? 4) Find the 95% confidence interval for the data above.