Mathematics, 30.03.2021 04:10 braxton24
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: 2
Mathematics, 21.06.2019 22:30
How can constraints be used to model a real-world situation?
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Mathematics, 22.06.2019 00:30
1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?
Answers: 2
Mathematics, 22.06.2019 01:30
Urgent need asap △abc is similar to △xyz. also, side ab measures 6 cm, side bc measures 18 cm, and side xy measures 12 cm. what is the measure of side yz ? enter your answer in the box.
Answers: 1
Mathematics, 22.06.2019 02:30
The graph shows the amount of total rainfall at each hour what was the total rainfall amount after three hours
Answers: 1
4. A factory manufactures treadmills and has a warranty of 5 years on their products. An engineer at...
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