Mean of the combined sample
A sample of n 4 scores has a mean of M 12. A second sample of n 6 scores has a mean of M 8. If the two samples are combined, what value will be obtained for the mean of the combined sample?
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A sample of n 8 scores has a mean of M 12. One new score is added to the sample and the new mean is found to be M 13. What is the value of the new score?
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He randomly samples 18 BMW drivers and finds out that the average annual salary for this sample is $78 974, with a population standard deviation of $7810. Use α = .01 to test the researcher's theory. Assume annual salaries are normally distr
Suppose a researcher believes that the average annual earnings of a BMW driver are lower now, and he sets up a study in an attempt to prove his theory.
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