The owner of a service station wants to determine if owners of new cars (two years old or less) change their car’s oil more frequently than owners of older cars (more than two years old). From his records he takes a sample of new cars and a sample of older cars and determines the number of times the oil was changed in the last 12 months. The data is as follows and the attached printout is provided for your use. New : 4, 3, 3, 2, 4, 3, 2 Old : 4, 2, 1, 2, 3, 2, 1 At 5% level of significance, Do these data allow the service manager to conclude that new car owners change their car’s oil, on the average, more frequently than older car owners?
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
The owner of a service station wants to determine if owners of new cars (two years old or less) change their car’s oil more frequently than owners of older cars (more than two years old). From his records he takes a sample of new cars and a sample of older cars and determines the number of times the oil was changed in the last 12 months. The data is as follows and the attached printout is provided for your use.
New : 4, 3, 3, 2, 4, 3, 2
Old : 4, 2, 1, 2, 3, 2, 1
At 5% level of significance, Do these data allow the service manager to conclude that new car owners change their car’s oil, on the average, more frequently than older car owners?
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