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Homework answers / question archive / A car manufacturer, Swanson, claims that the mean lifetime of one of its car engines is greater than 220,008 miles, which is the mean lifetime of the engine of a competitor

A car manufacturer, Swanson, claims that the mean lifetime of one of its car engines is greater than 220,008 miles, which is the mean lifetime of the engine of a competitor

Statistics

A car manufacturer, Swanson, claims that the mean lifetime of one of its car engines is greater than 220,008 miles, which is the mean lifetime of the engine of a competitor. The mean lifetime for a random sample of 28 of the Swanson engines was x = 226,450 miles with a standard deviation, s, of 11,504 miles. Test the Swanson's claim using a significance level of α = 0.05.

A)P-value = 0.00314 < 0.05, reject the null hypothesis. There is enough evidence to conclude that the mean lifetime of this car engine is greater than 220,008 miles.

B)P-value = 0.00629 < 0.05, reject the null hypothesis. There is enough evidence to conclude that the mean lifetime of this car engine is greater than 220,008 miles.

C)P-value = 0.00414 < 0.05, reject the null hypothesis. There is enough evidence to conclude that the mean lifetime of this car engine is greater than 220,008 miles.

D)P-value = 0.00669 < 0.05, reject the null hypothesis. There is enough evidence to conclude that the mean lifetime of this car engine is greater than 220,008 miles.

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