Historically, the time needed for college students to completetheir degree follows a normal distribution with a mean of 4 yearsand a standard deviation of 1.2 years. You wish to see if the meantime m has changed in recent years, so you collectinformation from 5 recent college graduates.
                                                      4.25     4           3.75      4.5 5
Is there evidence that the mean time is different from 4years?
a. Check the needed conditions for both the test statistic andconfidence interval. (Do not do a stemplot.)
b. State Ho and Ha
c. Calculate the test statistic (if applicable – state thedegrees of freedom)
d. Find the p-value
e. What is the conclusion for this problem? Do you rejectHo?
f. Calculate the 98% confidence interval.
g. Interpret this confidence interval
