Question

The Boston public school district has had difficulty maintaining on-time bus service for its students. Suppose the district develops a new bus schedule to help combat chronic lateness on a particularly woeful route. Historically, the bus service on the route has been, on average, 10 minutes late. After the schedule adjustment, the first 36 runs were an average of eight minutes late. As a result, the Boston public school district claimed that the schedule adjustment was an improvement—students were not as late. Assume a population standard deviation for bus arrival time of 10 minutes. Calculate the value of the test statistic.

Group of answer choices

z = −0.33

t35 = −0.33

z = −1.20

t35 = −1.20

The Department of Education would like to test the hypothesis that the average debt load of graduating students with a bachelor's degree is equal to $17,600. A random sample of 28 students had an average debt load of $18,800. It is believed that the population standard deviation for student debt load is $4800. The α is set to 0.05. The confidence interval for this hypothesis test would be ________.

Group of answer choices

[$15,072.93, $20,127.07]

[$16,513.53, $18,686.47]

[$17,022.05, $20,577.95]

[$14,352.73, $20,847.37]

Answer 1