# Question: For each value of d f look up the value of

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 percent confidence

b. d.f. = 80, 95 percent confidence

c. d.f. = 100, 95 percent confidence

a. d.f. = 40, 95 percent confidence

b. d.f. = 80, 95 percent confidence

c. d.f. = 100, 95 percent confidence

## Relevant Questions

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. ...A random sample of 10 shipments of stick-on labels showed the following order sizes. (a) Construct a 95 percent confidence interval for the true mean order size. (b) How could the confidence interval be made narrower? (Data ...In a sample of 500 new websites registered on the Internet, 24 were anonymous (i.e., they shielded their name and contact information). (a) Construct a 95 percent confidence interval for the proportion of all new websites ...Find ht interval [ μ – z σ / √ n μ + z σ / √ n = within which 95 percent of the sample means would be expected to fall, assuming that each sample is from a normal population. a. μ = 200, σ = 12, n = 36 b. μ = ...The city fuel economy of a 2009 Toyota 4Runner 2WD 6 cylinder 4 L automatic 5-speed using regular gas is a normally distributed random variable with a range 16 MPG to 21 MPG. (a) Estimate the standard deviation using Method ...Post your question