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A major company would like to assess the impact of using a professional trainer to conduct a confidence-building workshop with its salespeople. A sample of 16 workers is obtained. Half (n = 8) attend the workshop and the other half (n = 8) serves as a control group. Two weeks later, each of the participants is given a questionnaire measuring the level of self-confidence. The data are as follows:
Controls
Workshop
M = 17.5
M = 22.7
SS = 100
SS = 124
Use the sample data to construct an 80% confidence interval for the mean difference in confidence between the control group and the workshop conditions.
The lifetime of a color television picture tube is normally distributed with the mean of 7.8 years and a standard deviation of 3 years.
electric charge is distributed over the rectangle 1 x 2 0 y 2 so that the charge density at x y is sx y 2xy y2
1. in an urn there are two balls one with the number 2 and one with the number 3. when you pick from the urn the chance
A wire of length 50 feet is attached to the ground and to the top of an antenna. The height of the antenna is 10 feet larger than the distance from the base of the antenna to the point where the wire is attached to the ground.
Independently of the others. If the jury reaches a decision by majority rule, what is the probability that it will reach a wrong decision?
What sample size would be needed to obtain an error of +/- 10 square millimeters with 99% confidence?
Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
The Minneapolis Star Tribune newspaper has decided to write an article about gasoline prices in the Twin Cities area (Minneapolis and St. Paul).
create a time plot from the treasury bill returns data. here again just use the data. you need not answer the book
x1 = 100 and x2 = 127 successes were observed. What is the best point estimator for the difference ( p1-p2) in the two binomial proportions?
Determine the probability distribution for the number of Hondas in a sample of three cars chosen from the top nine and what is the likelihood that in the sample of three at least one Honda is included?
One of the problems encountered by corporations in America is finding an adequate number of employees who want to move into management. Recent surveys of workers in America taken by the Department of Labor in Washington D. C.
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