Using the simple random sample of weights of women from a data set, we obtain th
ID: 3176273 • Letter: U
Question
Using the simple random sample of weights of women from a data set, we obtain these sample statistics:
n=40 and x over bar =152.98 lb. Research from other sources suggests that the population of weights of women has a standard deviation given by =31.72 lb.
a. Find the best point estimate of the mean weight of all women.
b. Find a 95% confidence interval estimate of the mean weight of all women
a.The best point estimate is _______lb.
(Type an integer or a decimal.)
b. The 95% confidence interval estimate is _____lb < < ______lb.
(Round to two decimal places as needed
Explanation / Answer
a. best estimate of population mean is sample mean=152.98
b. t table value is 2.0227
So E=t*sd/sqrt(n)=10.14
Hence CI=mean+/-E=152.98+/-10.14=(142.84,163.12)
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