# Question

Find the standard error of the mean for each sampling situation (assuming a normal population). What happens to the standard error each time you quadruple the sample size?

a. σ = 24, n = 9

b. σ = 24, n = 36

c. σ = 24, n = 144

a. σ = 24, n = 9

b. σ = 24, n = 36

c. σ = 24, n = 144

## Answer to relevant Questions

For each value of d.f. look up the value of Student's t in Appendix D for the stated level of confidence. How close is the t-value to the corresponding z-value (at the bottom of the column for d.f. = ∞) ? a. d.f. = 40, 95 ...A random sample of monthly rent paid by 12 college seniors living off campus gave the results below (in dollars). Find a 99 percent confidence interval for , assuming that the sample is from a normal population. A car dealer is taking a customer satisfaction survey. Find the margin of error (i.e, assuming 95% confidence and π = .50) for (a) 250 respondents, (b) 125 respondents, and (c) 65 respondents. Use the following information x-bar = 50, σ = 15, n = 90, N = 1,000--to calculate confidence intervals for assuming the sample is from a normal population: (a) 90 percent confidence; (b) 95 percent confidence; (c) 99 ...In an intra-squad swim competition, men's freestyle 100 swim times at a certain university ranged from 43.89 seconds to 51.96 seconds. (a) Estimate the standard deviation using Method 3 (the Empirical Rule for a normal ...Post your question

0