# Chapter 1. Marginal Distributions

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Stat Tutor
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1:16

### Question 1.1

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Incorrect. A table is described as rxc where r represents the number of rows and c represents the number of columns. So, a 5x3 table has 5 rows and 3 columns.
Correct. A table is described as rxc where r represents the number of rows and c represents the number of columns. So, a 5x3 table has 5 rows and 3 columns.
Incorrect. Try again.
2

### Question 1.2

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Incorrect. A table is described as rxc where r represents the number of rows and c represents the number of columns. So, a 4x7 table has 4 rows and 7 columns.
Correct. A table is described as rxc where r represents the number of rows and c represents the number of columns. So, a 4x7 table has 4 rows and 7 columns.
Incorrect. Try again.
2

### Question 1.3

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Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2

1:56

### Question 1.4

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Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2

### Question 1.5

Should a woman ask a man out on a date?
Yes No Depends Total
Men 48 23 66 137
Women 30 69 93 192
Total 78 92 159 329
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Incorrect. In the cell where the “men” row intersects with “yes” column, we see the count “48”.
Correct. In the cell where the “men” row intersects with “yes” column, we see the count “48”.
Incorrect. Try again.
2

### Question 1.6

Should a woman ask a man out on a date?
Yes No Depends Total
Men 48 23 66 137
Women 30 69 93 192
Total 78 92 159 329
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Incorrect. In the “women” row, the row total is 192.
Correct. In the “women” row, the row total is 192.
Incorrect. Try again.
2

4:18

### Question 1.7

Should a woman ask a man out on a date?
Yes No Depends Total
Men 48 23 66 137
Women 30 69 93 192
Total 78 92 159 329
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Incorrect. The total for the “yes” column is 78. The table total is 329. The fraction of “yes” respondents is 78/329.
Correct. The total for the “yes” column is 78. The table total is 329. The fraction of “yes” respondents is 78/329.
Incorrect. Try again.
2

### Question 1.8

Should a woman ask a man out on a date?
Yes No Depends Total
Men 48 23 66 137
Women 30 69 93 192
Total 78 92 159 329
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Incorrect. The total number of women in the survey is 192 and the total number surveyed is 329. The fraction of respondents who were women is 192/329.
Correct. The total number of women in the survey is 192 and the total number surveyed is 329. The fraction of respondents who were women is 192/329.
Incorrect. Try again.
2

### Question 1.9

Should a woman ask a man out on a date?
Yes No Depends Total
Men 48 23 66 137
Women 30 69 93 192
Total 78 92 159 329
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Incorrect. Since we want a marginal distribution, the table total of 329 will be the denominator for every fraction. The column totals for opinion are 78, 92, and 159. The fractions are 78/329, 92/329 and 159/329.
Correct. Since we want a marginal distribution, the table total of 329 will be the denominator for every fraction. The column totals for opinion are 78, 92, and 159. The fractions are 78/329, 92/329 and 159/329.
Incorrect. Try again.
2

### Question 1.10

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