Consider the BLKFRI dataset (available in the 0.Data folder on NYUclasses). The YEARS

column states the number of years each of the 38 individuals in the sample have gone

shopping on Black Friday. We wish to draw inference about the average number of

years consumers have been shopping on Black Friday in the US if it is known that the

variance of the years of all consumers is 100.

a. Use the sample to conduct a 95% confidence level hypothesis test that the

average numbers of years consumers have went shopping on Black Friday in the

US is 10.

b. Use the sample to conduct a 99% confidence level hypothesis test that the

average numbers of years consumers have went shopping on Black Friday in the

US is 10.