1) ABC company claims that the average lifetime of a certain tire is at least 28000 km. To check the claim, a taxi compa

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1) ABC company claims that the average lifetime of a certain tire is at least 28000 km. To check the claim, a taxi compa

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1 Abc Company Claims That The Average Lifetime Of A Certain Tire Is At Least 28000 Km To Check The Claim A Taxi Compa 1
1 Abc Company Claims That The Average Lifetime Of A Certain Tire Is At Least 28000 Km To Check The Claim A Taxi Compa 1 (52.05 KiB) Viewed 235 times
1) ABC company claims that the average lifetime of a certain tire is at least 28000 km. To check the claim, a taxi company puts 40 of these tires on its taxis and gets a mean lifetime of 25560 km, with a standard deviation of 1350 km. Is the claim true using .05 level of significance?
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