manufacturer claims that the life span of its tires is 48 000 miles You work for a consumer protection agency and you are testing these tires
manufacturer claims that the life span of its tires is miles You work for a consumer protection agency and
manufacturer claims that the life span of its tires is miles You work for
life span of its tires is miles You work for a consumer protection agency and you are testing these tires
manufacturer claims that the life span of its tires is miles You
work for a consumer protection agency and you are testing these tires
manufacturer claims that the life span of its tires
manufacturer claims that the
manufacturer claims that the life span of its tires is 48,000 miles. You work for a consumer protection agency and you are testing these tires.

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manufacturer claims that the life span of its tires is 48,000 miles. You work for a consumer protection agency and you are testing these tires. Assume the life spans of the tires are normally distributed. You select 100 tires at random and test them. The mean life span is 47,845 miles. Assume sigma? =700.

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