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The U.S. Postal Service is attempting to reduce the number of complaints made by the public against its workers. In order to facilitate this task, a staff analyst for the service regresses the number of complaints lodged against an employee last year on the hourly wage of the employee for the year. The regression equation finds:
Y = 20.2 - 1.2X with a r2 of .73
What does r2 of .73 tell us? Is this a strong or weak correlation? How can you tell?
What is the probability you pick a plum and Which of the following is a legitimate probability distribution for this situation
Using alpha = 0.05 and a computed value of +4.49, can we conclude that the percentage of claims for married policyholders is less then for single policyholders?
Do 1-sample t-test to see if people in Chicago have travelled to fewer states than people nationwide. Utilize the 10% (.10) level of significance.
A business owner decides to use a binomial distribution to solve one of his problems.
Determine the coefficient of correlation between the two variables. Interpret the value.
Use frequency distribution to create a probability distribution, determine the (b) mean,(c) variance.
Do you benefit by using a cum sum chart rather than a control chart?
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
Construct a 95% confidence interval for the difference in the proportions of women and men who have regular exercise programs.
Using part(a), explain to investor differences between distribution of performance figures for the 2 kinds of stock funds.
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
the maximum point total for the quarter was 200. The point totals for the 10 students are given in the stemplot below. For the density curve displayed below, which of the following is true?
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