Suppose from random sample of 500 teenagers, the mean number of sweaters owned was 12.5 and a standard deviation of 6.1. Use the four-step process to find a 90% confidence interval for the mean number of sweaters owned by teenagers.
(a) Write the important information. (b) Verify the CLT conditions. (c) Calculate the margin of error and confidence interval.(d) Interpret the confidence interval, in context.
