The owner of a service station wants to determine if owners of new cars (two years old or less) change their cars' oil more frequently than owners of older cars (more than two years old). From his...

Extracted text: The owner of a service station wants to determine if owners of new cars (two years old or less) change their cars' oil more frequently than owners of older cars (more than two years old). From his records he takes a random sample of ten new cars and ten older cars and determines the number of times the oil was changed in the last 12 months. The data follow. Do these data allow the service station owner to infer at the 10% significance level that new car owners change their cars' oil more frequently than older car owners? Assume Equal variance case. Frequency of Oil Changes in Past 12 Months Old Cars Owners New Car Owners 6. 4 3 2 3 1 3 2 4 3 3 2 6. 2 5 3 5 2 4 1