Need helping answering the question and explaining the answer

1. A consumer group claims the mean acceleration time from 0 to 60 mph for sedans is more than 6.3 seconds. A sample of 33 sedans has a mean acceleration time of 7.2 seconds with a population standard deviation of 2.5 seconds. Test the claim at a = 0.05 by hand. a. Set up hypotheses and determine the claim. b. Find the critical value(s) X - 1 c. Determine the test statistic Z = Jn d. Decide whether the evidence supports the claim