In Exercises Z62-Z64, select the correct response(s). More than one may be corre
ID: 3333816 • Letter: I
Question
In Exercises Z62-Z64, select the correct response(s). More than one may be correct. 7.62. A 99% confidence interval for the difference n- between the proportions of men and women in California who are alcoholics equals (0.02, 0.09). (a) we are 99% confident that the proportion of alco- holics is between 0.02 and 0.09. (b) We are 99% confident that the proportion of men in California who are alcoholics is between 0.02 and 0.09 larger than the proportion of women in California who are alcoholics. (c) At this confidence level, there is insufficient evidence to infer that the population proportions are different. TjExplanation / Answer
7:62
Since confidence interval does not contain so at 1% level of significance we cannot conclude that there is no difference between the proprotions.
Correct option is C.
7.63:
(a)
Since confidence interval contains all positive values so there is evidence that mean income is higher for whites than for Hispanic.
Answer: this option is correct.
(b)
Since confidence interval contains zero so we fail to reject the null hypothesis.
Answer: this option is incorrect.
(c)
Since confidence interval contains zero so we fail to reject the null hypothesis.
Answer: this option is correct.
(d)
Answer: this option is incorrect.