Practice8-2

# Practice8-2 - BUAD 310 In-Class Practice 3/3/10 True/False:...

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- 1 - BUAD 310 In-Class Practice 3/3/10 True/False: 1. The standard error of the sample mean is n s / . True False 2. Assuming the same level of significance , as the sample size increases, the value of t /2 approaches the value of z /2 . True False 3. When the sample size and sample standard deviation remain the same, a 99% confidence interval for a population mean, μ will be narrower than the 95% confidence interval for μ . True False 4. The larger the p-value, the more we doubt the null hypothesis. True False 5. A contingency table summarizes data that has been classified on two dimensions or scales. True False Fill-in-the-Blank: 1. In the construction of a confidence interval, as the confidence level required in estimating the mean increases, the width of the confidence interval ______________. 2. As the margin of error decreases, the width of the confidence interval _______________. 3. When testing a hypothesis about a single mean, if the sample size is 51, and the population standard deviation is known, the correct test statistic to use is ___________. 4. The _____ hypothesis is not rejected unless there is sufficient sample evidence to do so. 5. The chi-square goodness of fit test for multinomial probabilities with 5 categories has _____ degrees of freedom. Multiple Choice: 1. A confidence interval for a population mean with known σ increases in width as A) the confidence level decreases

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- 2 - B) sample size n increases C) standard deviation σ increases D) All of the above E) None of the above 2. Which of the following is true about t -distributions? A) they are left-skewed B) they are specified by one parameter: the mean C) as the degrees of freedom increase, they approach the chi-square distribution D) they have more probability in the tail than the standard normal distribution E) the peak of each t -density curve is higher than the peak of the standard normal density 3. Suppose you are doing hypothesis testing for a population mean, the population standard deviation is unknown, and the sample size is 19. To find the p-value, you will use A) uniform distribution B) standard normal distribution C) t distribution with 19 degrees of freedom
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## This note was uploaded on 09/05/2010 for the course BUAD 310 taught by Professor Lv during the Spring '07 term at USC.

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Practice8-2 - BUAD 310 In-Class Practice 3/3/10 True/False:...

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