The service manager of a car dealer wants to determine if owners of new cars (two years old or less)tune up their cars 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 cars were tuned up 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 tune up their cars more frequently than older car owners? 
Definitions:
Dependent Variables
Variables in a study that are expected to change or vary as a result of manipulations or treatments applied to independent variables.
Factorial Designs
Experimental designs that allow investigation of the effects of multiple factors (independent variables) and their interactions on one or more outcomes (dependent variables).
Real-world Conditions
Circumstances or situations that occur in everyday life outside of controlled or laboratory settings.
Independent Variables
Variables that are manipulated or changed in an experiment to observe their effects on dependent variables.
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