Question

A city council member is faced with constituents complaining about how long it's taking to fix potholes. The city used to use a contractor whose mean time to repair a pothole was 3.2 days The council member thinks that the new contractor's mean time to repair a pothole higher than 3.2 days. She randomly selects a sample of 12 pothole service calls and obtains the following times to repair (in days):

6.2, 4.3, 7.1, 2.9, 5.4, 3.7, 5.5, 0.7, 7.5, 5.6, 2.6, 1.7

is there enough evidence to support the councilmembers claim? ( Use =0.05 level of significance). Show all the steps of an appropriate hypothesis test. Assume all conditions are satisfied for your chosen hypothesis test.

Answer 1