A random sample of n = 900 observations from a binomial population produced x = 655 successes. Estimate the binomial proportionp and calculate the margin of error. Construct a 90% confidence interval.

You measure 33 textbooks' weights, and find they have a mean weight of 62 ounces. Assume the population standard deviation is 4.6 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight

Estimate the minimum sample size needed to achieve the margin of error E= 0.026 for a​ 95% confidence interval.

Suppose that your sample size is 30 and that you wish to construct a 95% confidence interval. Your sample standard deviation is 40.9. Estimate your margin of error (MOE) using this information and the t-distribution table. Estimate your response to the first decimal point.

Estimate the minimum sample size needed to achieve the margin of error E=0.013 for a​ 95% confidence interval.

Use the given confidence interval to find the margin of error and the sample mean. (13.5,21.9)

A professor wants to estimate how many hours per week her students study. A simple random sample of 72 students had a mean of 19 hours of studying per week. Construct a 90% confidence interval for the mean number of hours a student studies per week. Assume that the population standard deviation is known to be 2.1 hours per week. Round to two decimal places.

Suppose you construct a 90% confidence interval for the true population mean GPA of students at Taft College. If all of the sample values remained constant and you decreased the confidence level, what would happen to the width of your confidence interval? Edit View Incort

We asked 41 people to report the number of cars they've ever owned. The results are a mean of 4.6 and a standard deviation of 1.3. Construct a 80% confidence interval.