（1） A study reported that 55% of Americans say parents are doing too much for their...

（1） A study reported that 55% of Americans say parents are doing too much for their young adult children these days. The smallest sample size for which the sampling distribution of sample proportion is approximately normal is （） . (Your answer must be an integer.)

（2）To estimate the average income among all U.S. workers, we obtain a simple random sample of 1000 U.S. workers and calculate their average income. Then, we should

(I) conclude that the average income among all U.S. workers is the value we calculated.

(II) compute a confidence interval for the average income of all U.S. workers.

(III) perform a test of significance to see if the sample data are reliable.

A. (I) only B. (II) only C. (III) only D. (I) and (II) only E. (I) and (III) only F. (II) and (III) only

Solutions

Expert Solution

Given p = 55% = 0.55

For the approximation to the normal

（2）To estimate the average income among all U.S. workers, we obtain a simple random sample of 1000 U.S. workers and calculate their average income. Then, we should

Once obtained sample the hypothesis test and confidence interval are necessary to obtain

(II) compute a confidence interval for the average income of all U.S. workers.

(III) perform a test of significance to see if the sample data are reliable.

The correct answer is:

F. (II) and (III) only

orchestra answered 11 months ago

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