# Chapter 1. Expected Cell Counts in Two-Way Tables

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0:35

### Question 1.1

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Correct. A “YES” answer says: There is association between student smoking and parent’s smoking.
Incorrect. A “YES” answer says: There is association between student smoking and parent’s smoking.
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1:34

### Question 1.2

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Correct. This is a correct statement.
Incorrect. This is a correct statement.
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1:46

### Question 1.3

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Correct. The red numbers are the counts “observed” in the data.
Incorrect. The red numbers are the counts “observed” in the data.
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2:02

### Question 1.4

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Correct. The expected counts are the counts we “expect” to observe if the null hypothesis of no association were true.
Incorrect. The expected counts are the counts we “expect” to observe if the null hypothesis of no association were true.
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2:20

### Question 1.5

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Correct. Regardless of parent’s smoking, overall $$\frac{1004}{5375}$$ = 0.187 or 18.7% of students smoke.
Incorrect. Regardless of parent’s smoking, overall $$\frac{1004}{5375}$$ = 0.187 or 18.7% of students smoke.
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3:14

### Question 1.6

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Correct. (0.1868)(2239) = 418.2
Incorrect. (0.1868)(2239) = 418.2
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4:12

### Question 1.7

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Correct. $$\frac{(1356)(1004)}{5375}$$ = 353.3
Incorrect. $$\frac{(1356)(1004)}{5375}$$ = 353.3
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5:19

### Question 1.8

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Correct. This is a correct statement.
Incorrect. This is a correct statement.
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