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Computer database GROWCO describes the characteristics of 100 companies identified by Fortune as among the fastest growing. Two of the variables listed are (1) estimated stock price/earnings ratio next year and (2) annual revenue growth (as a percentage).
a. Determine the least-squares regression equation for y = next year's price/earning ratio estimate as a function of annual revenue growth. What would be the predicted value of y for a company whose annual revenue growth has been 150%?
b. What percentage of the variation in the magazine's price/earnings estimates (y) is explained by the annual revenue growth percentage (x)? At the 0.05 level, does the slope of the equation differ signifi- cantly from 0?
c. Given 150%, construct and interpret the 95% confidence and prediction intervals associated with y.
a. When events A and B are mutually exclusive, then P(A and B) = P(A) + P(B). b. The union of events A and B consists of all outcomes in the sample space that are contained in both event A and event B. c. When two events A and B are independent, the ..
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Downs and Abwender (2002) evaluated soccer players and swimmers to determine whether the routine blows to the head experienced by soccer players produced long-term neurological deficits.
Given that the population standard deviation is not known, which of these two confidence intervals should be used as the interval estimate for μ?
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As part of study of the development of the thymus gland, researchers weighed the glands of five chick embryos after 14 days of incubation. Calculate the standard error of the mean.
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