Practice_Test_11

# Practice_Test_11 - Practice Test 11 AP Statistics Name...

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Practice Test 11 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. The heights (in inches) of males in the United States are believed to be normally distributed with mean µ . The average height of a random sample of 25 American adult males is found to be x = 69.72 inches and the standard deviation of the 25 heights is found to be s = 4.15. The standard error of x is (a) 0.17 (b) 0.69 (c) 0.83 (d) 1.856 (e) 2.04 The next two questions refer to the following situation: In some mining operations, a byproduct of the processing is mildly radioactive. Of prime concern is the possibility that release of these byproducts into the environment may contaminate the freshwater supply. There are strict regulations for the maximum allowable radioactivity in supplies of drinking water, namely an average of 5 picocuries per liter (pCi/L) or less. However, it is well known that even safe water has occasional hot spots that eventually get diluted, so samples of water are assumed safe unless there is evidence to the contrary. A random sample of 25 specimens of water from a city’s water supply gave a mean of 5.39 pCi/L and a standard deviation of 0.87 pCi/L. 2. The appropriate null and alternative hypotheses are: (a) H 0 : µ = 5.39 vs H a : µ 5.39 (b) H 0 : µ = 5.39 vs H a : µ < 5.00 (c) H 0 : µ = 5 vs H a : µ = 5.39 (d) H 0 : µ = 5 vs H a : µ < 5 (e) H 0 : µ = 5 vs H a : µ > 5

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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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Practice_Test_11 - Practice Test 11 AP Statistics Name...

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