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The IQs of 17 students from one area of a city showed a mean of 106 with a standard deviation of 10, whereas the IQs of 14 students from another area showed a mean of 109 with a standard deviation of 7. Test for equality of variances between the IQs of the two groups at α = 0.02.
The mean GMAT score of 65 applicants who were accepted into the MBA program of Xavier Business School was 520 with a standard deviation of 25. About how many applicants scored between 470 and 570 on the GMAT?
What is the probability that the second one selected is defective given that the first one was defective? (c) What is the probability that both are defective?
What is probability that all specimen of one of the two types of rock are selected for analysis?
a data set consists of 247 test scores. over a long period it has been found that the mean and standard deviation for
A local politician in this town has stated that the average property taxes are $1800 and most people do not pay more than this amount. Conduct a test at the alpha = .01 level to determine if this is true. For this test, consider a sample size of 3..
The airline must sell 150 seats to break even on this particular flight. On what percent of the flights does the airline make money?
state two research hypotheses that can be tested using a one-tailed t test and discuss why a one-tailed t test would be
Bob Nale is the owner of Nale's Quick Fill. Bob would like to estimate the mean number of gallons of gasoline sold to his customers.
a basket of 1000 parts is selected at random from a shipment of 50 baskets. the chance of any single part being
Since Richard has not attended class recently, he doesn't know any of the answers. Assuming that Richard guesses on all ten questions, what is the probability he answers at least half correctly?
Develop a 95% confidence interval for the population mean number of hours spent watching videos and DVDs last year.
We say that two things have a positive relationship if they move in the same direction, or as one thing increases, so does the other. Or if one thing decreases, so does the other.
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