15. D The National Center for Health Statistics reports that the average weight
ID: 3065480 • Letter: 1
Question
15. D The National Center for Health Statistics reports that the average weight in a sample of U.S. men aged 18 to 70 is 186 pounds. If the sample size is 1000 and the population standard deviation is 17.2 pounds, the standard error of the sampling distribution of the sample mean weight is 0.131 pounds 0.017 pounds 5.822 pounds 0.544 pounds E. None of these answers are correct. 16. B Which of the following is true for the sampling distribution of the sample mean? A. the curve will be approximately normal for any sample size irrespective of the population distribution shape the shape will be approximately normal for large samples C. the sample mean determines the spread or width of the distribution. D. the sampling distribution is centered on the sample variance. E. none of these answers are correct. 17, E L=C-/n You plan to build a 99% confidence interval estimate of the mean of a large population. You want a margin of error no larger than +11. You estimate the population standard deviation to be 150. How large a sample is needed? 1472 35 1010 1468 1238Explanation / Answer
solution15d:
standard error=population sd/sqrt(sample size)
=17.2/sqrt(1000)
=17.2/31.62278
=0.5439117
ANSWER:0.544
OPTIOND
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