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Question: The mean height of American men aged 20-29 is 70.0 inches, with a standard deviation of 3.0 inches (Statistical Abstract of the United States: 2009, 2008).
a. The minimum height required for men to join the U.S. Army is 60 inches. What proportion of the population is excluded?
b. What proportion of the population is taller than Napoleon Bonaparte, who was 52?
below are the lifetimes in hours of fifty 40-watt 110-volt internally frosted incandescent lamps taken from forced
16 parts are examined for defects. It is found that 10 are good, 4 have minor defects, and 2 have major defects What is the probability that both are good? What is the probability that exactly one part has a major defect?
The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes.
in quality-control projects engineers use charts where item values are plotted and compared with 3 standard-deviation
given a sample size of 34 with sample mean of 660.3 and stand dev of 104.9 we have the hypotheseisnull is h0u700alt hyp
the data shown in table are chemical process yield readings on successive days read down then across. construct a
The number of rescue calls received by a rescue squad in a city follows a Poisson distribution with µ = 2.83 per day.
Compute the 99% confidence interval for the percentage of packages that are delivered damaged in the population.
Your manufacturing process makes parts such that each part meets specifications with probability 0.98. You need a batch of 250 parts that meet specifications.
Discuss possible study designs. Which of the designs would we use to test our research hypothesis?
A weight-loss company wants to statistically prove that its methods work. They randomly selected 10 clients who had been on the weight loss program for between 55 and 65 days. They looked at their beginning weights and their current weight. The st..
what is the difference between the goodness-of-fit test for equal expected frequencies and unequal expected
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