Suppose the time that it takes a certain large bank to approve a home loan is Normally distributed, with mean (in days) / and standard deviation o = 1. The bank advertises that it approves loans in 5 days, on average, but measurements on a random sample of 500 loan applications to this bank gave a mean approval time of x = 5.3 days. Is this evidence that the mean time to Macmillan Learning approval is actually longer than advertised? To answer this, test the hypotheses Ho : M = 5, Ha : M > 5 at significance level a = 0.01. You conclude that: O Ho should not be rejected. O Ha should be rejected. O there is a 5% chance that the null hypothesis is true. O Ho should be rejected