# Question: Find the standard error of the mean for each sampling

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 = 32, n = 4

b. σ = 32, n = 16

c. σ = 32, n = 64

a. σ = 32, n = 4

b. σ = 32, n = 16

c. σ = 32, n = 64

## Answer to relevant Questions

Calculate a confidence interval for assuming that each sample is from a normal population. a. x-bar = 24, σ = 3, n = 10, 90 percent confidence b. x-bar = 125, σ = 8, n = 25, 99 percent confidence c. x-bar = 12.5, σ = ...The fuel economy of a 2011 Lexus RX 350 2WD 6 cylinder 3.5 L automatic 5-speed using premium fuel is normally distributed with a known standard deviation of 1.25 MPG. If a random sample of 10 tanks of gas yields a mean of ...A random sample of 10 items is drawn from a population whose standard deviation is unknown. The sample mean is x-bar = 270 and the sample standard deviation is s = 20. Use Appendix D to find the values of Student's t. a. ...Should p be assumed normal? a. n = 25, π = .50 b. n = 60, π = 20 c. n = 100, π = .08 In a grocery parking lot, 32 of 136 cars selected at random were white. (a) Construct a 99 percent confidence interval for the true proportion of white cars. (b) May normality of p be assumed? Explain.Post your question