Question 1
Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval of a population mean.
A researcher wishes to estimate the mean height of women aged between 60 and 65 in the U.S. She desires a margin of error of 0.1 inches. Past studies suggest that a population standard deviation of
is reasonable. Estimate the minimum sample size needed to estimate the population mean with the stated accuracy.
◦ 2178
◦ 66
◦ 4356
◦ 436
Question 2
Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval of a population mean.
A college teacher wishes to estimate the mean number of hours worked per week at non-college related jobs by full-time students at the college. He desires a margin of error of 1.3 hours. Past studies suggest that a population standard deviation of 13.6 hours is reasonable. Estimate the minimum sample size needed to estimate the population mean with the stated accuracy.
◦ 219
◦ 438
◦ 569
◦ 21
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How many grams of tartaric acid, H2C4H4O6, (molar mass = 150.10 g) are needed to