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A national study has determined that people who work full time average 43.4 hours worked per week. Assume that the number of hours worked per week for those who work full time is normally distributed. Suppose 12% of these workers work more than 48 hours. Based on this percentage, what is the standard deviation of number of hours worked per week for those workers.
Bob Billy is an operations analyst for Dollar-Does-It stores based in Iva, SC. He is currently studying the order and stocking policies for top-selling toy.
a) Draw the scatter diagram. Does it appear that x and y are related? If so, how? b) Test to determine whether there is evidence of a linear relationship.
Discuss what happens to the width of the confidence interval as the confidence level is increased. Does this seem reasonable? Explain.
Explain the conclusion that there were no statistically significant differences (p ≥ 0.05) between the benefits of behavioral therapy and psychoanalysis when treating an eating disorder.
How would you explain the analysis of variance, assuming that your audience has not had a statistics class before?
Insurance policy from company A costs $300 a year but guarantees to replace any losses due to theft. Create the decision tree.
The R.R. Bowker Company of New York collects information on the retail prices of collectible children's books and publishes its findings in Publisher's Weekly.
Jill constructs a test to measure a personality state. The test consists of multiple items which sum up to indicate the degree of the trait that is present.
If the market research gave a positive indication the price would be £35,000. If the market research gave a negative indication the price would be only £3,000.
Compute average daily rainfall in the week and for weekends. Get the average of weekdays' rainfalls and average of weekend's rainfalls.
Two mating parts have critical dimensions x1 and x2 as shown below. Assume that x1 and x2 are normally distributed with means 1 and mean2 and standard deviations s1 = 0.400 and s2 = 0.300.
In 1992, FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and found that 1,143 were positive.
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