Question: Reliability of household appliances. Always ask whether a particular variable is really a suitable measure for your purpose. You are writing an article for a

Reliability of household appliances. Always ask whether a particular variable is really a suitable measure for your purpose.

You are writing an article for a consumer magazine based on a survey of the magazine’s readers on the reliability of their household appliances. Of 13,376 readers who reported owning Brand A dishwashers, 2942 required a service call during the past year.

Only 192 service calls were reported by the 480 readers who owned Brand B dishwashers.

(a) Why is the count of service calls (2942 versus 192) not a good measure of the reliability of these two brands of dishwashers?

(b) Use the information given to calculate a suitable measure of reliability. What do you conclude about the reliability of Brand A and Brand B?

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