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15. Ten pairs of chicks were selected to test the effect of a vitamin supplement on early growth. The chicks in each pair were

siblings of high birth weight. One chick in each pair was given the supplement and the other was not. After two weeks, the

weight of each chick was recorded. The researcher would like to test the research hypothesis that the supplement increases

the growth rate of chicks in the first weeks after hatching against the null hypothesis that it has no effect? The most

appropriate test would be ______.

a) the Z-test

b) the paired-sample T-test

c) the T-test for two independent samples

d) the T-test

e) None of the above

16. In a study of possible correlation between the height, x in cm and the weight, y in kg, of chimpanzees, a sample of 40 animals

produces a correlation coefficient of ?=0.813, and a regression line with equation ? =0.34?+19.5. What is the expected

weight of a 80 cm tall chimpanzee?

a) 34.8 ??

b) 46.7 ??

c) 24.0 ??

d) 57.1 ??

e) 177.9 kg

17. In #16, what does the correlation coefficient tell you?

a) There is no linear correlation between the height and weight of a chimpanzee.

b) That for every 1 cm more in height a chimpanzee is, it weighs 0.813 more kg.

c) There is a weak positive linear correlation between the height and weight of a chimpanzee.

d) That for every 1 kg more in weight a chimpanzee is, it is 0.813 cm taller.

e) There is a strong positive linear correlation between the height

18. Fill in the blank. _________ of the data is found between Q1 and Q3.

a) 95%

b) 75%

c) 68%

d) 50%

e) impossible

19. Which of the following is not an example of a categorical variable?

a) the age of a particular voter

b) the county of residence of a particular voter

c) the marital status of a particular voter

d) the political party affiliation of a particular voter

e) All of the above are categorical

20. A large sample 95% confidence interval for the proportion of hotel reservations that are canceled on the intended arrival day

is (0.048,0.112). What is the point estimate (the ?) for the proportion of hotel reservations that are canceled on the intended arrival day from which this interval was constructed?

a) 0.032

b) 0.048

c) 0.064

d) 0.080

e) Not enough information given

D Math 80 hw E Saved Upgrade to Pro & & B C K A V - Sign - 15 Ten pairs of chicks were selected to test the effect of a vitamin supplement on early growth. The chicks in each pair were siblings of high birth weight. One chick in each pair was given the supplement and the other was not. After two weeks, the weight of each chick was recorded. The researcher would like to test the research hypothesis that the supplement increases the growth rate of chicks in the first weeks after hatching against the null hypothesis that it has no effect? The most appropriate test would be a) the Z-test b) the paired-sample T-test c) the T-test for two independent samples d) the T-test e) None of the above. 16 In a study of possible correlation between the height, x in cm and the weight, y in kg, of chimpanzees, a sample of 40 animals produces a correlation coefficient of r = 0.813, and a regression line with equation y = 0.34x + 19.5. What is the expected weight of a 80 cm tall chimpanzee? a) 34.8 kg b) 46.7 kg c) 24.0 kg d) 57.1 kg e) 177.9 kg 17 In #16, what does the correlation coefficient tell you? a) There is no linear correlation between the height and weight of a chimpanzee. b) That for every 1 cm more in height a chimpanzee is, it weighs 0.813 more kg. c) There is a weak positive linear correlation between the height and weight of a chimpanzee. d) That for every 1 kg more in weight a chimpanzee is, it is 0.813 cm taller. e) There is a strong positive linear correlation between the height and weight of a chimpanzee. 18 Fill in the blank. of the data is found between Q1 and Q3. a) 95% b) 75% C) 68% d) 50% e) impossible to tell 19 Which of the following is not an example of a categorical variable? a) the age of a particular voter b) the county of residence of a particular voter c) the marital status of a particular voter d) the political party affiliation of a particular voter e) All of the above are categorical. 20 A large sample 95% confidence interval for the proportion of hotel reservations that are cancelled on the intended arrival day is (0.048, 0.112). What is the point estimate (the p) for the proportion of hotel reservations that are canceled on the intended arrival day from which this interval was constructed? a) 0.032 b) 0.048 c) 0.064 d) 0.080 e) Not enough information given. Page 3 of 6