Practice questions exam 2

# Practice questions - Spring 2009 STATISTICS 371-001 Practice Questoions for Midterm Exam#2 Laughlin NOTE You must show all work in order to receive

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Spring 2009 STATISTICS 371-001 Laughlin Practice Questoions for Midterm Exam #2 NOTE: You must show all work in order to receive full credit for a problem (and this will help you receive partial credit if you make an error), including any formulas that are used in solving the problem. 1. What is the difference (conceptually not numerically) between the standard deviation and the standard error? Include in your answer the distributions to which they each apply. 2. About 2% of the American population has red hair. In a survey of a random sample of 200 American actresses and actors, 20 have red hair. Construct a 90% confidence interval for the proportion of the American population that has red hair and state the result using appropriate “confidence interval” language. Be sure to consider the appropriate Z value in determining the estimate of the population proportion. Also remember that for large samples, the t table can be used to determine Z table values (i.e., you don’t need Table 3 to do this problem).

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## This note was uploaded on 04/07/2009 for the course STAT 371 taught by Professor Koscik during the Spring '08 term at Wisconsin.

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Practice questions - Spring 2009 STATISTICS 371-001 Practice Questoions for Midterm Exam#2 Laughlin NOTE You must show all work in order to receive

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