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Unformatted text preview: sample of players is 198, so that number is your point estimate. Assume that the population standard deviation is = 11.50. What is a 90 percent confidence interval for the population weight, if you presume the players' weights are normally distributed? This question is the same as asking what weight values correspond to the upper and lower limits of an area of 90 percent in the center of the distribution. You can define that area by looking up in Table 2 (in "Statistics Tables") the z-scores that correspond to probabilities of 0.05 in either end of the distribution. They are 1.65 and 1.65. You can determine the weights that correspond to these z-scores using the following formula:...
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- Fall '08