A car manufacturer, Swanson, claims that the mean lifetime of one of its car engines is greater than 220,000 miles, which is the mean lifetime of the engine of a competitor. The mean lifetime for a random sample of 23 of the Swanson engines was x= 226,450 miles with a standard deviation, s, of 11,500 miles. Test the Swanson's claim using a significance level of a = 0.01. use one-mean t-test to perform the hypothesis test use probability-value approach

MATLAB: An Introduction with Applications
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A manufacturer makes steel bars that are supposed to have a
mean length of 50 cm. A retailer suspects that the bars are
running too long. A sample of 38 bars is taken and their mean
length is determined to be 51 cm. Using a 1% level of
significance, perform a hypothesis test to determine whether the
population mean is greater than 50 cm. Assume that the
population standard deviation is 3.6 cm.
use one-mean z-test
to perform the
hypothesis test
use critical-value
approach
Transcribed Image Text:A manufacturer makes steel bars that are supposed to have a mean length of 50 cm. A retailer suspects that the bars are running too long. A sample of 38 bars is taken and their mean length is determined to be 51 cm. Using a 1% level of significance, perform a hypothesis test to determine whether the population mean is greater than 50 cm. Assume that the population standard deviation is 3.6 cm. use one-mean z-test to perform the hypothesis test use critical-value approach
A car manufacturer, Swanson, claims that the mean lifetime of
one of its car engines is greater than 220,000 miles, which is the
mean lifetime of the engine of a competitor. The mean lifetime
for a random sample of 23 of the Swanson engines was
x= 226,450 miles with a standard deviation, s, of 11,500 miles.
Test the Swanson's claim using a significance level of a= 0.01.
use one-mean t-test
to perform the
hypothesis test
use
probability-value
approach
Transcribed Image Text:A car manufacturer, Swanson, claims that the mean lifetime of one of its car engines is greater than 220,000 miles, which is the mean lifetime of the engine of a competitor. The mean lifetime for a random sample of 23 of the Swanson engines was x= 226,450 miles with a standard deviation, s, of 11,500 miles. Test the Swanson's claim using a significance level of a= 0.01. use one-mean t-test to perform the hypothesis test use probability-value approach
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