Reconsider the previous two exercises and the data in TestTimes.
a. Conduct a t-test of whether the slope coefficient differs significantly from zero. Report the value of the test statistic and p-value.
b. Produce a 95% confidence interval for the population slope coefficient.
c. Interpret this confidence interval.
d. Are the test result and confidence interval consistent with each other? Explain.

Data from previous exercises

The data file TestTimes contains data on the time (in minutes) taken by 33 students to complete a multiple choice exam and the students’ scores (as a percentage out of 100) on the exam. Investigate whether the data provide evidence of an association between the time to take the test and the score achieved on the test.