Mathematics, 28.05.2020 22:58 xxtonixwilsonxx
A light bulb manufacturer claims that a certain type of bulb they make has a mean lifetime of 1000 hours and a standard deviation of 20 hours. Each package sold contains 4 of these bulbs. Suppose that each package represents an SRS of bulbs, and we calculate the sample mean lifetime \bar x x ˉ x, with, \bar, on top of the bulbs in each package. 1. What is the null and alternative hypotheses? 2. At a = .02, do you have enough evidence to reject the manufacturer's claim?
Answers: 1
Mathematics, 21.06.2019 15:00, froyg1234
Little’s law firm has just one lawyer. customers arrive randomly at an average rate of 6 per 8 hour workday. service times have a mean of 50 minutes and a standard deviation of 20 minutes. how long does a customer spend at little’s law firm on average?
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Mathematics, 21.06.2019 16:20, mattmaddox86
The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%
Answers: 2
A light bulb manufacturer claims that a certain type of bulb they make has a mean lifetime of 1000 h...
Mathematics, 13.01.2021 21:30
Mathematics, 13.01.2021 21:30
Mathematics, 13.01.2021 21:30
Mathematics, 13.01.2021 21:30
Mathematics, 13.01.2021 21:30