Then, the 95% confidence interval for µ is ___(a) and the 99% confidence interval for u is _(b). If we want the 99% confidence interval to be shorter than 0.5, we need the sample size n to be at least _(c).

Suppose that a random sample of 11 adult US males has a mean height is 69 inches with a standard deviation of 2.9 inches. If we assume that the height of adult males in the US are normally distributed, find a 90% confidence interval for the mean height of all US meals. Give the lower limb and upper limit of the 90% confidence interval. Carrier intermediate computations to at least three decimal places. Andrew answers to one decimal point.

A pharmaceutical company claims that its new drug reduces systolic blood pressure. The systolic blood pressure (in millimeters of mercury) for nine patients before taking the new drug and 22 hours after taking the drug are shown in the table below. Using this data, find the 90%90% confidence interval for the true difference in blood pressure for each patient after taking the new drug. Assume that the blood pressures are normally distributed for the population of patients both before and after taking the new drug. Patient 1 2 3 4 5 6 7 8 9 Blood pressure (before) 174174 176176 204204 180180 204204 189189 177177 181181 187187 Blood pressure (after) 166166 164164 194194 157157 178178 178178 156156 175175 178178   Step 2 of 4 :   Calculate the sample standard deviation of the paired differences. Round your answer to six decimal places.

Suppose that the population of lengths of all fully grown male killer whales is approximately normally distributed. A recent article published in the Zoology Now journal claims that the mean of this population is 6.99 m. You want to test the claim made in the article, so you select a random sample of 10 fully grown male killer whales and record the length of each. Follow the steps below to construct a 90% confidence interval for the population mean of all lengths of fully grown male killer whales. Then state whether the confidence interval you construct contradicts the article's claim. (If necessary, consult a list of formulas.) (a) Click on "Take Sample" to see the results for your random sample. (b) Take Sample Point estimate: 0 Sample standard deviation: 0 Critical value: 0 Compute Enter the values of the sample size, the point estimate of the mean, the sample standard deviation, and the critical value you need for your 90% confidence interval. (Choose the correct critical value…