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Explain briefly and in nontechnical language what "a significant difference (P < 0.01)" means. (b) Explain clearly and briefly what "95% confidence" means. (c) Is this study good evidence that requiring job training of all welfare mothers would greatly reduce the percent who remain on welfare for several years?
The dean of a nursing school claims that the average starting salary of its graduates is more than 60 (in $000's). It is known that the population standard deviation is 10 (in $000's).
Your workplace reduces all workplace scores on particular employee aptitude test in z-scores which are placed in district-wide distribution of scores.
The Type 1 error states the probability of being wrong whenever:
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
Many newspapers carry a certain puzzle in which the individual must unscramble letters to form words. How many ways can the letters of YARNLE be arranged?
Determine the probability that employee will make 28 or more sales during 100-call shift? Allocate a Random Variable x.
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
How many subsets of S contain either the number 6 or the number 15?
Sample data are reported for 50 employees of small companies, 75 employees of medium companies, and 100 employees of large companies.
A description of a Pew Research Center poll referred to "the random generation of the last two digits of telephone numbers." Each digits has the same chance of being randomly generated. Construct a table representing the probability distribution f..
Assume that the mean useful life of a particular lightbulb is 2,000 hours and is normally distributed with a standard deviation of 300 hours. Determine the percentage of lightbulbs that will last 2,300 hours or longer.
Determine the probability that Mexican American male in the 20 -74 age range has serum cholesterol value greater than 240 mg/dl.
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