In a certain industry, it is known that the standardized regression coefficient for predicting likely profit from number of advertisements is .7. A company is planning to place 18 advertisements. Which of the following pieces of information will be
needed as part of predicting the actual amount of profit?
A) Length of time the company has been in business
B) Mean and standard deviation of the number of advertisements in general
C) This company’s profit to date
D) Median and variance of the number of advertisements in general
Answer: B
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