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Assume that the helium porosity of coal samples taken from any particular seam is Normally distributed with true standard deviation 0.75.
a. Compute a 95% CI for the true average porosity of a certain seam if the average porosity for 20 specimens from the seam was 4.85.
b. Compute a 98% CI for true average porosity of another seam based on 16 specimens with a sample average of 4.56.
c. How large a sample size is necessary if the width of the 95% interval is to be 0.40?
d. What sample size is necessary to estimate the true average porosity to within 0.2 with 99% confidence?
Over the last year the absentee rate at a large corporation averaged 8.2 days absent with a standard deviation of 6 days. One department with 40 employees had an absentee rate of 12 days per employee.
The entire batch will be rejected if at least one of those tested is defective. What is the probability that the entire batch wili be rejected?
Give an example of how to use a t-test to analyze the data from the Table of Variables and list the grouping variable and continuous variable that you would include in the analysis
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A baseball fan would like to estimate the mean time it takes to complete a major league baseball game. He randomly selects 40 game lengths (times to complete games) for major league baseball games and finds the mean to be 178 minutes with a standard ..
At the 0.05 significance level, can we conclude that equal numbers of Canadian retirees living in Hawaii came from each of the four cities?
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The corporation there's a pretty good chance the average number of days absent would be 12 or more. that's what happened to us chance variation. Is this a good defense? Justify your answer.
Create a graph and draw the regression line based on these two pairs of scores, plus the X value 1 1 and its predicted score on Y.
suppose that x is a continuous random variable with a probability distribution fx 2x25 where x is between 0 and 5
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