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IBM Corporation has been retraining many of its employees to assume marketing positions. As part of this effort, the company wanted to test four possible methods of training marketing personnel to determine if at least one of the methods was better than the others. Four groups of 70 employees each were assigned to the four training methods. The employees were pretested for marketing ability and put into groups of four, each group constituting a block with approximately equal prior ability. Then the four employees in each group were randomly assigned to the four training methods and retested after completion of the three-week training session.
The differences between their initial scores and ?nal scores were computed. The results were analyzed using a block design ANOVA. The results of the analysis include: SSTR = 9,875, SSBL = 1,445, and SST = 22,364. Are all four training methods equally effective? Explain.
A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the standard deviation of the weekly expenditure is $125.
Prostate cancer are actually proven correct through subsequent biopsy. JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
From experience he knows that he can go another 15 miles. What is the probability that he will be stranded on the highway without gasoline?
during the past three weeks sales of a brand of medicine have been as followsweeksales171270369using exponential
let x be a random variable that represents the ph of arterial plasma. for healthy adults the mean of the x distribution
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question in a given large town the number of children x in a family chosen at random has the following
Two balls, each equally likely to be colored either red or blue, are put in an urn. At each stage one of the balls is randomly chosen, its color is noted, and it is then returned to the urn. If the first two balls chosen are colored red, what is t..
Based on the following results, is LIFO more effective in keeping the value of his inventory lower? Product FIFO LIFO. What is the null hypothesis?
To begin with, I have an example problem that asks to find a complete solution for: y'+ 2xy = x. The text says to multiply both sides by e^int a(x) dx
whites represent 77.7 of the usa and 38.8 is on welfare blacks represent 13.2 of the usa and 39.8 is on welfare and
Determine the mean and the standard deviation of the sample.
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