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We give the mean and the standard deviation of a sample that has been randomly selected from a population. For each exercise, find estimated tolerance intervals that contain approximately 68.26 percent, 95.44 percent, and 99.73 percent of the individual population measurements. Also, find a 95 percent confidence interval for the population mean. Interpret the estimated tolerance intervals and the confidence interval in the context of the situation related to the exercise. The mean and the standard deviation of the sample of 42 trash bag breaking strengths are formula 67.mml = 50.575 and s = 1.6438.
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Assume that the weights of coconuts are normally distributed with a mean weight of 17.6 pounds and a standard deviation of 1.2 pounds.
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
A pair of dice is tossed once. Let X denote the sum of the face values, and let Y denote the absolute value of the difference between the face values.
Provide two examples for each source of measurement error and include how each example might likely influence research results.
In the last quarter of 2007 a group of 64 mutual funds had a mean return of 0.9% with a standard deviation of 5.2%. Consider the normal model N(0.009.052) for the returns of these mutual funds.
An investigator wants to design a study to estimate the difference in the proportions of men and women who develop early onset cardiovascular disease
The variance of the return per share is 4 for stock 1 and 100 for stock 2. The covariance of the return between the two stocks is 5 per share. Use the total variance of the investment as investment risk.
A manufacturer of a chemical used in glue, attempting to control the amount of a hazardous chemical its workers are exposed to, has given instructions to halt production if the mean amount in the air exceeds 3.0 ppm.
What are some differences between discrete and continuous data? Is the measurement of money continuous or discrete? Explain. Can discrete data be analyzed using a normal distribution? Why or why not?
Chebyshev's Theorem states that the percentage of observations in a data set that should fall within five standard deviations of their mean is
In grading eggs into small, medium and large, Margi farms packs the eggs that weigh more than 4.25 ounces in packages marked " large" and the eggs that weigh less than 2.45 ounces in packages marked " small" the remainder are packed in packages ma..
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