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An economist is interested in studying the spending habits of consumers in a particular region. The population variance is known to be $1,000,000. A random sample of 50 individuals resulted in an average expense of $15,000. What is the width of the 99% confidence interval?
The height of women at a school are basically distributed with mean 66.4 in. and standard deviation 3.7 in. Determine the range of heights centered about the mean in which:
This sample group has errors with a standard deviation of 54.7ft. At the 5% level of significance, test that the new population has errors with a standard deviation equal to 43.7ft.
What is Bayesian sample size determination for ANOVA and regression with formula?
Compute a 90 percent confidence interval for the difference among the two population proportions. The CEO of the company would like to find out if Canadians.
A bag contains 5 blue balls and 8 purple balls. If 3 balls are chosen randomly and without replacement, form the bag. Let x be the number of blue balls obtained. Then x has a distribution.
The total blood cholesterol concentrations, in mg/dL, are shown below for a random sample of six people. In the table below, x is the age of the subject and y is the subject's total cholesterol concentration. Find the 95% prediction interval when ..
Given the following data, 1) how do you make Excel create a scatter diagram for you? 2) If you were to draw a line through the points, how straight would the line be?
Find the value for the correlation coefficient r.
A random variable X that has pmf given by p(x) = 1/ (n+1) over the range Rx = {0,1,2,...,n} is said to have a discrete uniform distribution. Find the mean and variance of this distribution.
For the mold described in (g), can you find the probability that it's COST value will exceed $150,000? If yes, obtain this probability. If no, why not?
If the manufacturer's claim is true, what is the probability that the claim will be rejected?
Construct a 95% confidence interval estimate for the population proportion of adults who report that e-mails are easy to misinterpret.
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