Mathematics, 30.03.2021 04:20 jerrygentry3411
4. A factory manufactures treadmills and has a warranty of 5 years on their products. An engineer at
the factory believes that the treadmills do not last that long and will malfunction in less than 5 years.
He tests a sample of 40 treadmills and find the average time to be 4.8 years with a standard deviation
of 0.50. (5 points)
a. State the null and alternative hypotheses
b. At the 95% confidence level, is there enough evidence to support the engineer's claim?
Answers: 1
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4. A factory manufactures treadmills and has a warranty of 5 years on their products. An engineer at...
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