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According to a government study among adults in the 25- to 34-year age group, the mean amount spent per year on reading and entertainment is $2,020. Assume that the distribution of the amounts spent follows the normal distribution with a standard deviation of $456. (Round z-score computation to 2 decimal places and your final answer to 2 decimal places. Omit the "%" sign in your response.)
(a) What percent of the adults spend more than $2,600 per year on reading and entertainment?
(b) What percent spend between $2,600 and $2,900 per year on reading and entertainment?
(c) What percent spend less than $1,200 per year on reading and entertainment?
Compute the mean and standard deviation of the scores and use these for the calculations below. Show your calculations on the back of his page.
because only two of the seven regression coefficients are statistically significant. Yet in some initial trials the expanded model is giving more precise sales predictions than the smaller model. The reasons for this anomaly are now being investig..
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