# Test 11A - Test 11A AP Statistics Name: Directions: Work on...

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Test 11A AP Statistics Name: Directions: Work on these sheets. Tables and formulas appear on a separate sheet. Part 1: Multiple Choice. Circle the letter corresponding to the best answer. 1. In preparing to use a t procedure, suppose we were not sure if the population was normal. In which of the following circumstances would we not be safe using a t procedure? (a) A stemplot of the data is roughly bell shaped. (b) A histogram of the data shows moderate skewness. (c) A stemplot of the data has a large outlier. (d) The sample standard deviation is large. (e) The t procedures are robust, so it is always safe. 2. The weights of 9 men have mean x = 175 pounds and standard deviation s = 15 pounds. What is the standard error of the mean? (a) 58.3 (b) 19.4 (c) 5 (d) 1.7 (e) None of the above. The answer is . 3. What is the critical value t* that satisfies the condition that the t distribution with 8 degrees of freedom has probability 0.10 to the right of t* ? (a) 1.397 (b) 1.282 (c) 2.89 (d) 0.90 (e) None of the above. The answer is . 4. Suppose we have two SRSs from two distinct populations and the samples are independent. We measure the same variable for both samples. Suppose both populations of the values of these variables are normally distributed but the means and standard deviations are unknown. For purposes of

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## This note was uploaded on 11/03/2011 for the course STATS 101 taught by Professor Smith during the Spring '11 term at University of Colorado Denver.

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Test 11A - Test 11A AP Statistics Name: Directions: Work on...

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