Use the method of Exercise 13.7 to rework Exercise 13.49.
In exercise
In a random sample, s = 2.53 minutes for the amount of time that 30 women took to complete the writ-ten test for their driver’s licenses. At the 0.05 level of significance, test the null hypothesis σ = 2.85 minutes against the alternative hypothesis σ < 2.85 minutes. (Use the method described in the text.)