Construct a 90% confidence interval for the true proportion p given a sample of n = 200 with x = 85 successes.

Identify the t-score for a 95% confidence interval if the sample size is 15. t =  the answer isnt 2.131 so what is the answer?

Suppose we know that a confidence interval for a population proportion is (0.105,0.355), with a sample proportion of p̂=0.23. What is the margin of error?

A 95% confidence interval for a population proportion, p, is 0.23 < p < 0.27. What was the sample proportion?

For a sample with a mean of 10, a std of 5 and an n of 30, what is the lower bound of the 95% confidence interval?

Suppose you compute a confidence interval with a sample size of 37. What will happen to the confidence interval if the sample size increases to 70?

A random sample of high school seniors were asked whether they were applying for college. The resulting confidence interval for the proportion of students applying for college is (0.65,0.69). What is the margin of error?

In the construction of an 88% Confidence Interval for a population mean u, a has the value of

A researcher takes a random sample of 100 Americans that have never had a pet and a separate random sample of 100 Americans that are current or previous pet owners. She is interested in determining whether there is a difference in the proportion of individuals who believe in the afterlife among these two groups. She observes that 76 of the "never pet owners" and 84 of the "ever pet owners" believe in the afterlife. Determine the margin of error for a confidence interval for the difference in the two appropriate proportions at a 95% confidence level. a. The assumptions necessary to perform the calculation are not satisfied. b. 0.0837 c. 0.0719 d. 0.1103 e. 1.96

If n=230 and p (p-hat) = 0.61, construct a 95% confidence interval. Give your answers to three decimals