Statistics Chapter 12 Solutions Essay example

9429 Words Dec 15th, 2012 38 Pages

1. When testing for independence in a contingency table with 3 rows and 4 columns, there are ________ degrees of freedom. a) 5 b) 6 c) 7 d) 12

ANSWER: b TYPE: MC DIFFICULTY: Easy KEYWORDS: chi-square test of independence, degrees of freedom

2. If we use the [pic] method of analysis to test for the differences among 4 proportions, the degrees of freedom are equal to: a) 3. b) 4. c) 5. d) 1.

ANSWER: a TYPE: MC DIFFICULTY: Easy KEYWORDS: chi-square test for difference in proportions, degrees of freedom

3. If we wish to determine whether there is
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A study was conducted to determine whether brand awareness of female TV viewers and the gender of the spokesperson are independent. Each in a sample of 300 female TV viewers was asked to identify a product advertised by a celebrity spokesperson. The gender of the spokesperson and whether or not the viewer could identify the product was recorded. The numbers in each category are given below.

| |Male Celebrity |Female Celebrity |
|Identified product |41 |61 |
|Could not identify |109 |89 |

10. Referring to Table 12-2, which test would be used to properly analyze the data in this experiment? a) test for independence. b) test for difference between proportions. c) ANOVA F test for main treatment effect. d) test for goodness of fit.

ANSWER: a TYPE: MC DIFFICULTY: Moderate KEYWORDS: chi-square test of independence

11. Referring to Table 12-2, the calculated test statistic is a) -0.1006. b) 0.00. c) 5.9418. d) 6.1194. ANSWER: c TYPE: MC DIFFICULTY: Easy KEYWORDS: chi-square test of independence,

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