Question

the Bell corporation is the parent corporation that franchises automobile lube and oil change centers around the United States. The standard set forth by the Bell Corporation is that at least 80 percent of all cars will have their lube and oil service completed in 10 minutes or less. Periodically, representatives from the Bell company visit the franchises and perform a compliance test on this standard. They randomly select 50 cars (without the local operator's knowledge) and record how long it takes to service each car
a) establish appropriate null and alternative hypotheses
b) Determine the decision rule assuming that the company performs the appliance test using a significance level of 0.05
c) Determine if the franchise is operating within its standard. In the sample, 108 cars were serviced in 10.0 minutes or less

Answer 1

at least 87 cars for bit c answer.