A USA based cable broadband company wants to investigate whether it's east coasts customers have a higher average customer satisfaction score than compared to it's west coast customers. The customer survey asks for a score between 1 and 5, with 1 being poor and 5 being excellent. 174 east coast customers are surveyed, and the sample mean is 3.35 with a sample standard deviation of 0.51. For the west coast, 355 customers are surveyed, and the sample mean is 3.24 with a sample standard deviation of 0.52.

a.

D Question 18 5 pts What is the null and alternative hypothesis for this test? O Ho : Heast - Hwest Ous Ha : Heast - Hwest > 0 O Ho : Heast - Hwest = 0 us Ha : Heast - Hwest / 0 O Ho : Xeast - Xwest = 0 us Ha : Xeast - Xwest # 0