Question

30 people are selected randomly from a certain town and their mean age is 32.2. Assume that the population standard deviation is 8.5.

a) Check assumptions and determine an appropriate interval procedure.

b) Find a 95% confidence interval for the true mean age, μ, of everyone in the town. (Do not use any functions in TI=>STAT=>TESTS to show your work.)

c) Interpret the confidence interval

Answer 1