A metropolitan transportation authority has set a bus mechanical reliability goal of 3,800 bus miles. Bus mechanical reliability is measured specifically as the number of bus miles between mechanical road calls. Suppose a sample of 100 buses resulted in a sample mean of 3,825 bus miles and a sample standard deviation of 175 bus miles. Complete parts(a) and(b) below.

USE A .10 level of SIGNIFICANCE

a. The critical value(s) for the test statistic is(are)

(round to two decimal places)