1.The Corvallis Reporter claimed in a recent issue that the average assembly time for the new Ford Cool Car is approximately 39 hours. Recently a modification in the assembly procedure was made to reduce the average assembly time of the Cool Car. A systematic random sample of 45 vehicles finds that the average assembly time is 38.5 hours.Experience with the new assembly method indicates that Is their evidence that the new method reduced the assembly time on average? Use a significance level of 0.05

a.Question of interest:

b.Parameter of interest (notation and description in context):

c.Significance level:

d.State the null and alternative hypotheses.

e.Check the conditions. State each and describe whether they are met.

f.Showing setup/work, calculate a 95% confidence interval for . Answer in interval notation, including units (if applicable).

g.Write the two-part conclusion for the confidence interval in context (see lecture notes for template).

h.Showing setup/work, calculate the test-statistic:

i.What is the p-value for the test? Is it one-sided or two-sided?

j.Write the two-part conclusion for the hypothesis test in context (see lecture notes for template).