（1） A study reported that 55% of Americans say parents are doingtoo much for their young adult children these days. The smallestsample size for which the sampling distribution of sampleproportion is approximately normal is （ ） . (Your answer must be aninteger.)
（2）To estimate the average income among all U.S. workers, weobtain a simple random sample of 1000 U.S. workers and calculatetheir average income. Then, we should
(I) conclude that the average income among all U.S. workers isthe value we calculated.
(II) compute a confidence interval for the average income of allU.S. workers.
(III) perform a test of significance to see if the sample dataare 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
