Sam wants to compare the efficiency of his work group in completing a renovation project compared to the population of workers at his company. He and his 4 team members (N = 5) complete the average renovation job in 3.5 days, compared to the population which generally takes 4.75 days, with an average difference (standard deviation) of .5 days).

a) Use the 5 steps of hypothesis testing to answer the question, is Sam's group different from the population? This with a p-value or significance level of .01.

b) Calculate the 95% Confidence Interval for the problem above.

c) How big of an effect (how big of a difference) does Sam's group have? (Calculate effect size)