e2answersspring08

e2answersspring08 - STA 103 Exam 2 Spring 2008 I. H....

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Unformatted text preview: STA 103 Exam 2 Spring 2008 I. H. Dinwoodie NAME Calculator allowed, closed book. STA103 Spring 2008 E2 1 Circle True or False. (1 point each) 1. The population of American women in 1975 had incomes that averaged = 10, with standard deviation = 7 (in units of $10,000). A random sample of 1,000 women was drawn. (a) T The sample mean is an unbiased estimator of . (b) F The sample variance s 2 is a biased estimator of 2 . (c) F The probability distribution of the sample mean X has a density that resembles the probability histogram of the population. (d) F The variance of the sample mean is the same as the variance of the population. (e) F A 95% confidence interval for is wider than a 99% confidence interval for . (f) F A 99% confidence interval for will always contain the mean . (g) F The mean squared error (MSE) of the sample mean for estimating is 2 . (h) F The mean squared error (MSE) of the sample mean for estimating is greater than the MSE of a single draw. (i) T The sample mean has a probability distribution that is bell-shaped and is more tightly concentrated around than the distribution of the population. (j) T The probability histogram of the sample should resemble the prob- ability histogram of the population. STA103 Spring 2008 E2 2 2. (4 points) At a large Midwest factory, 4 men and 4 women on the assembly line2....
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This note was uploaded on 09/29/2008 for the course STAT 103 taught by Professor Dinwoodie during the Spring '08 term at Duke.

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e2answersspring08 - STA 103 Exam 2 Spring 2008 I. H....

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