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A recent article in Vitality magazine reported that the mean amount of leisure time per week for American men is 40 hours. You believe this figure is too large and decide to conduct your own test. In a random sample of 60 men, you find that the mean is 37.8 hours of leisure per week and that the standard deviation of the sample is 12.2 hours. Can you conclude that the information in the article is untrue? Use the 0.05 significance level. Determine the p-value and explain its meaning.
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours
According to Fortune, Missouri is within 500 miles of 44% of all U.S. manufacturing plants 8. If a Missouri company needs parts manufactured in 122 different plants, what is the probability that at least half of them can be found within 500 miles ..
At.05 significance level, is there a difference in mean number of calls per day between 2 employees? Compute the p -value?
Assume it is known that the distribution of purchase amounts by customers entering a popular retail store is approximately normal with mean $25 and standard deviation $8.
Use Random Number Generation (RNG) in Analysis ToolPak of Excel to generate n = 5 observations from the Normal distribution N(20, 5). Construct the 95% confidence interval for μ.
What information does each measure of central tendency provide? Why are measures of variability essential statistical tools for describing behavior?
Complete the test at the 5% level of significance.
The weight of the oranges, in pounds (1 pound = 16 ounces) is a random variable with standard deviation
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time.
The weight of a product is normally distributed with a mean of four ounces and a variance of .25 "squared ounces." What is the probability that the randomly selected unit from a recently manufactured batch weighs no more than 3.50 ounces.
A market research company surveyed consumers to determine their ranked preferences of energy drinks among the brands Monster, Red Bull, and Rockstar.
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