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Assuming a normal population distribution with a mean of 125 and a standard deviation of 25, what is the probability of obtaining the following means for groups of subjects chosen by random sampling?
a. Sample mean = 130 or higher, N = 25
b. Sample mean = 130 or higher, N = 81
c. Sample mean = 130 or lower, N = 81
d. Sample mean = 120 or higher, N = 36
e. Sample mean = 120 or lower, N = 49
Markets can be segmented by the following variables: geographic, demographic, social, or behavior. If you were to select a segmentation variable suited best for the motorcycle market, which variable would you select?
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A manufacturer claims that the mean lifetime, mean, of its light bulbs is 52 months. The standard deviation of these lifetimes is 7 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 55 months.
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