What is the confidence interval for the population mean u? ng << hg (Round to one decimal place as needed)

Construct a confidence interval for p, - p, at the given level of confidence. X1 = 398, n1 = 543, x2 = 408, n2 = 578, 99% confidence The researchers are % confident the difference between the two population proportions, p, - p2, is between and (Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)

Which of these is NOT a way to express a confidence interval for the mean? (59.41, 81.72) 46.78 < x̄ < 62.90 42 ± 3.2 45.2 < μ < 63.7

A researcher wants to estimate the mean blood cholesterol level of young men ages 15-25 with a 90.16% confidence interval. The blood cholesterol level of young men follows a Normal distribution with standard deviation σ = 15 mg/dl. How large a sample would the researcher need to take to estimate the mean blood cholesterol to within 7 mg/dl? A sample of at least______people