find the critical value of t with a c below it for the given confidence level c and sample size n
c=0.95, n=12 D.f =, Table t value=
c=0.98, n=20 D.f=, Table t value=
construct the indicated confidence interval for the population mean looks like a funny shaped u with a hook using a t-distribution. b if you incorrectly uses a normal distribution, which interval would be wider"
c=0.95, x with line on top=13.4, s=0.85, n=8
this is a random sample mean and the sample standard deviation. Assume the random variable is normall distributed and use the t-distribution to find the mrgins of error and construct a 95% confidence interval for the population mean. Interpret the results.
Commute Time to Work in a random sample of eight people, the mean commute time to work was 35.5 minutes and the sample standard deviation was 7.2 minutes