The manufacturer of a new fiberglass tire claims that its average life will be at least 40,000 miles. To verify this claim a sample of 12 tires is tested, with their lifetimes

(in 1,000s of miles) being as follows:

Test the manufacturer’s claim at the 5 percent level of significance.

Transcribed Image Text:

Tire 1 2 4 56 7 8 10 3 9 11 12 Life 36.1 40.2 33.8 38.5 42 35.8 37 41 36.8 37.2 33 36