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Stat Tutor

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4:40

Incorrect. This is a correct statement because the fractions in the distribution must add to 1.0. Thus, the denominator has to be the same for all fractions.

Correct. This is a correct statement because the fractions in the distribution must add to 1.0. Thus, the denominator has to be the same for all fractions.

Incorrect. Try again.

2

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 |

Incorrect. Since “women” is a specific category and opinion is one of the variables for the table, we want the conditional distribution for women. Thus the denominator is the count of all women, namely, 192, and the three numerators are the three opinion counts for “Yes," “No” and “Depends” in the “women” row.

Correct. Since “women” is a specific category and opinion is one of the variables for the table, we want the conditional distribution for women. Thus the denominator is the count of all women, namely, 192, and the three numerators are the three opinion counts for “Yes," “No” and “Depends” in the “women” row.

Incorrect. Try again.

2

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 |

Incorrect. Since “Yes” is a specific category and gender is one of the variables for the table, we want the conditional distribution for the “Yes” category. Thus the denominator is the count of all those who responded “Yes," namely, 78, and the two numerators for gender are the count for “men” and the count for “women” in the “Yes” row.

Correct. Since “Yes” is a specific category and gender is one of the variables for the table, we want the conditional distribution for the “Yes” category. Thus the denominator is the count of all those who responded “Yes," namely, 78, and the two numerators for gender are the count for “men” and the count for “women” in the “Yes” row.

Incorrect. Try again.

2

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 |

Incorrect. asking for the “fraction of the men," we are restricting the table to only the row for “men," making 137 the denominator. Of the men, 48 responded “Yes." So, the fraction is 48/137.

Correct. asking for the “fraction of the men," we are restricting the table to only the row for “men," making 137 the denominator. Of the men, 48 responded “Yes." So, the fraction is 48/137.

Incorrect. Try again.

2

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 |

Incorrect. By asking for the fraction of those who responded “Yes," we are restricting the table to only the column for the “Yes” responses, making 78 the denominator. Of those who responded “Yes," 48 were men. So, the fraction is 48/78.

Correct. By asking for the fraction of those who responded “Yes," we are restricting the table to only the column for the “Yes” responses, making 78 the denominator. Of those who responded “Yes," 48 were men. So, the fraction is 48/78.

Incorrect. Try again.

2

5:25

Incorrect. Some might prefer column conditional distributions for comparison, but most people prefer row conditional distributions for comparison.

Correct. Some might prefer column conditional distributions for comparison, but most people prefer row conditional distributions for comparison.

Incorrect. Try again.

2

6:55

Incorrect. When responses for one variable are NOT associated with responses for the other variable, the row conditionals are should be about the same.

Correct. When responses for one variable are NOT associated with responses for the other variable, the row conditionals are should be about the same.

Incorrect. Try again.

2

Incorrect. When responses for one variable are associated with responses for the other variable, the row conditionals are different.

Correct. When responses for one variable are associated with responses for the other variable, the row conditionals are different.

Incorrect. Try again.

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7:52

Should a woman ask a man out on a date? | ||||
---|---|---|---|---|

Yes | No | Depends | Total | |

Men | 0.35 | 0.17 | 0.48 | 1.00 |

Women | 0.16 | 0.36 | 0.48 | 1.00 |

Total | 0.24 | 0.28 | 0.48 | 1.00 |

Incorrect. The proportion of men who said “Yes” at 0.35 is much different than the proportion of women who said “Yes” at 0.16. Similarly, the proportion of men who said “No” at 0.17 is much different than the proportion of women who said “Yes” at 0.36. Thus, with so much difference between the two conditionals, we have to say that there is potential association.

Correct. The proportion of men who said “Yes” at 0.35 is much different than the proportion of women who said “Yes” at 0.16. Similarly, the proportion of men who said “No” at 0.17 is much different than the proportion of women who said “Yes” at 0.36. Thus, with so much difference between the two conditionals, we have to say that there is potential association.

Incorrect. Try again.

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Is kissing on a first date appropriate? | ||||
---|---|---|---|---|

Never | Seldom | Sometimes | Total | |

Men | 0.18 | 0.35 | 0.47 | 1.00 |

Women | 0.18 | 0.37 | 0.45 | 1.00 |

Total | 0.18 | 0.36 | 0.45 | 1.00 |

Incorrect. The proportion of men who said “Never” at 0.18 equals the proportion of women who said “Never” at 0.18. Similarly, the proportion of men who said “Seldom” at 0.35 is close to the proportion of women who said “Seldom” at 0.37. And similarly, the proportion of men who said “Sometimes” at 0.47 is close to the proportion of women who said “Sometimes” at 0.45. Thus, with the two conditionals so close to each other, we have to say that there is NO potential association.

Correct. The proportion of men who said “Never” at 0.18 equals the proportion of women who said “Never” at 0.18. Similarly, the proportion of men who said “Seldom” at 0.35 is close to the proportion of women who said “Seldom” at 0.37. And similarly, the proportion of men who said “Sometimes” at 0.47 is close to the proportion of women who said “Sometimes” at 0.45. Thus, with the two conditionals so close to each other, we have to say that there is NO potential association.

Incorrect. Try again.

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