SME_8e_Ch_15_Section_3

SME_8e_Ch_15_Section_3 - CHAPTER 15 SECTION 3 CHI-SQUARED...

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1 CHAPTER 15 SECTION 3: CHI-SQUARED TESTS MULTIPLE CHOICE 119. If we want to conduct a two-tail test of a population proportion, we can employ: a. z -test of a population proportion. b. the chi-squared test of a binomial experiment since z 2 = χ 2 . c. the chi-squared test of a contingency table. d. Both a and b ANS: D PTS: 1 REF: SECTION 15.3 120. If we want to conduct a one-tail test of a population proportion, we can employ: a. z -test of a population proportion. b. the chi-squared test of a binomial experiment since z 2 = 2 . c. the chi-squared test of a contingency table. d. Both a and b ANS: A PTS: 1 REF: SECTION 15.3 121. Which statistical technique is appropriate when we describe a single population of qualitative data with exactly two categories? a. The z -test of a population proportion. b. The chi-squared goodness-of-fit test. c. The chi-squared test of a contingency table. d. Both a and b. ANS: D PTS: 1 REF: SECTION 15.3 122. The chi-squared distribution is used in: a. a goodness-of-fit test. b. a test of a contingency table. c. describing a population having more than two categories. d. All of these choices are true. ANS: D PTS: 1 REF: SECTION 15.3 123. Which of the following statements is true for chi-squared tests? a. Testing for equal proportions is identical to testing for goodness-of-fit. b. The number of degrees of freedom in a test of a contingency table with r rows and c columns is ( r - 1)( c - 1). c. The number of degrees of freedom in a goodness-of-fit test with k categories is k - 1. d. All of these choices are true. ANS: D PTS: 1 REF: SECTION 15.3

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2 124. Which of the following tests does not use the chi-squared distribution? a. Test of a contingency table. b. Goodness-of-fit test. c. One tailed test for two proportions. d. None of these choices. ANS: C PTS: 1 REF: SECTION 15.3 125. Which statistical technique is appropriate when we compare two or more populations of qualitative data with two or more categories? a. The z -test of the difference between two proportions. b. The chi-squared goodness-of-fit test. c. The chi-squared test of a contingency table. d. Both a and b. ANS: C PTS: 1 REF: SECTION 15.3 126. Which of the following tests is appropriate for nominal data if the problem objective is to compare two populations and the number of categories exceeds 2? a. The z -test for one proportion, p , or difference of two proportions, p 1 - p 2 . b. The chi-squared goodness-of-fit test. c. The chi-squared test of a contingency table. d.
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This note was uploaded on 09/28/2010 for the course FINOPMGT 250 taught by Professor Kumar during the Spring '10 term at University of Massachusetts Boston.

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SME_8e_Ch_15_Section_3 - CHAPTER 15 SECTION 3 CHI-SQUARED...

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