SECTION 18.1 1. Which method? Which of the following scenarios should be analyzed as paired data? a) Students take an MCAT prep course. Their before and after scores are compared. b) 20 male and 20 female students in class take a midterm. We compare their scores. c) A group of college freshmen are asked about the quality of the university cafeteria. A year later, the same students are asked about the cafeteria again. Do student’s opinions change during their time at school?

Question

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Answer 1

Textbook Question

Chapter 21, Problem 1E

SECTION 18.1

1. Which method? Which of the following scenarios should be analyzed as paired data?

a) Students take an MCAT prep course. Their before and after scores are compared.
b) 20 male and 20 female students in class take a midterm. We compare their scores.
c) A group of college freshmen are asked about the quality of the university cafeteria. A year later, the same students are asked about the cafeteria again. Do student’s opinions change during their time at school?

a.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents the scores of the students in MCAT.

Justification:

The scores of the students were paired because the scores of the students before and after were dependent on the MCAT prep course.

b.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is not paired.

Explanation of Solution

Given info:

The data represents the scores of the males and females students.

Justification:

The scores of the male and female studentswere not pairedbecause the scores of the male is different and independent from the scores of female.

c.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents on selecting the group of freshmen to know the quality of the cafeteria at the beginning and a year later.

Justification:

The data taken from the students were paired because the survey was taken twice from the students. The response of the students was integrated.

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Students have asked these similar questions

(c) Because logistic regression predicts probabilities of outcomes, observations used to build a logistic regression model need not be independent. A. false: all observations must be independent B. true C. false: only observations with the same outcome need to be independent I ANSWERED: A. false: all observations must be independent. (This was marked wrong but I have no idea why. Isn't this a basic assumption of logistic regression)

Business discuss

Spam filters are built on principles similar to those used in logistic regression. We fit a probability that each message is spam or not spam. We have several variables for each email. Here are a few: to_multiple=1 if there are multiple recipients, winner=1 if the word 'winner' appears in the subject line, format=1 if the email is poorly formatted, re_subj=1 if "re" appears in the subject line. A logistic model was fit to a dataset with the following output: Estimate SE Z Pr(>|Z|) (Intercept) -0.8161 0.086 -9.4895 0 to_multiple -2.5651 0.3052 -8.4047 0 winner 1.5801 0.3156 5.0067 0 format -0.1528 0.1136 -1.3451 0.1786 re_subj -2.8401 0.363 -7.824 0 (a) Write down the model using the coefficients from the model fit.log_odds(spam) = -0.8161 + -2.5651 + to_multiple + 1.5801 winner + -0.1528 format + -2.8401 re_subj(b) Suppose we have an observation where to_multiple=0, winner=1, format=0, and re_subj=0. What is the predicted probability that this message is spam?…

Answer 2

Textbook Question

Chapter 21, Problem 1E

SECTION 18.1

1. Which method? Which of the following scenarios should be analyzed as paired data?

a) Students take an MCAT prep course. Their before and after scores are compared.
b) 20 male and 20 female students in class take a midterm. We compare their scores.
c) A group of college freshmen are asked about the quality of the university cafeteria. A year later, the same students are asked about the cafeteria again. Do student’s opinions change during their time at school?

a.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents the scores of the students in MCAT.

Justification:

The scores of the students were paired because the scores of the students before and after were dependent on the MCAT prep course.

b.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is not paired.

Explanation of Solution

Given info:

The data represents the scores of the males and females students.

Justification:

The scores of the male and female studentswere not pairedbecause the scores of the male is different and independent from the scores of female.

c.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents on selecting the group of freshmen to know the quality of the cafeteria at the beginning and a year later.

Justification:

The data taken from the students were paired because the survey was taken twice from the students. The response of the students was integrated.

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Answer 3

Textbook Question

Chapter 21, Problem 1E

SECTION 18.1

1. Which method? Which of the following scenarios should be analyzed as paired data?

a) Students take an MCAT prep course. Their before and after scores are compared.
b) 20 male and 20 female students in class take a midterm. We compare their scores.
c) A group of college freshmen are asked about the quality of the university cafeteria. A year later, the same students are asked about the cafeteria again. Do student’s opinions change during their time at school?

a.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents the scores of the students in MCAT.

Justification:

The scores of the students were paired because the scores of the students before and after were dependent on the MCAT prep course.

b.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is not paired.

Explanation of Solution

Given info:

The data represents the scores of the males and females students.

Justification:

The scores of the male and female studentswere not pairedbecause the scores of the male is different and independent from the scores of female.

c.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents on selecting the group of freshmen to know the quality of the cafeteria at the beginning and a year later.

Justification:

The data taken from the students were paired because the survey was taken twice from the students. The response of the students was integrated.

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Answer 4

Textbook Question

Chapter 21, Problem 1E

SECTION 18.1

1. Which method? Which of the following scenarios should be analyzed as paired data?

a) Students take an MCAT prep course. Their before and after scores are compared.
b) 20 male and 20 female students in class take a midterm. We compare their scores.
c) A group of college freshmen are asked about the quality of the university cafeteria. A year later, the same students are asked about the cafeteria again. Do student’s opinions change during their time at school?

a.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents the scores of the students in MCAT.

Justification:

The scores of the students were paired because the scores of the students before and after were dependent on the MCAT prep course.

b.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is not paired.

Explanation of Solution

Given info:

The data represents the scores of the males and females students.

Justification:

The scores of the male and female studentswere not pairedbecause the scores of the male is different and independent from the scores of female.

c.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents on selecting the group of freshmen to know the quality of the cafeteria at the beginning and a year later.

Justification:

The data taken from the students were paired because the survey was taken twice from the students. The response of the students was integrated.

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Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

a.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents the scores of the students in MCAT.

Justification:

The scores of the students were paired because the scores of the students before and after were dependent on the MCAT prep course.

b.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is not paired.

Explanation of Solution

Given info:

The data represents the scores of the males and females students.

Justification:

The scores of the male and female studentswere not pairedbecause the scores of the male is different and independent from the scores of female.

c.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents on selecting the group of freshmen to know the quality of the cafeteria at the beginning and a year later.

Justification:

The data taken from the students were paired because the survey was taken twice from the students. The response of the students was integrated.

Answer 8

a.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents the scores of the students in MCAT.

Justification:

The scores of the students were paired because the scores of the students before and after were dependent on the MCAT prep course.

Answer 9

a.

Expert Solution

Answer 10

a.

Expert Solution

Answer 11

Expert Solution

Answer 12

To determine

Identify the situation that has paired data.

Answer 13

Answer to Problem 1E

The data is analyzed as paired.

Answer 14

Explanation of Solution

Given info:

The data represents the scores of the students in MCAT.

Justification:

The scores of the students were paired because the scores of the students before and after were dependent on the MCAT prep course.

Answer 15

b.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is not paired.

Explanation of Solution

Given info:

The data represents the scores of the males and females students.

Justification:

The scores of the male and female studentswere not pairedbecause the scores of the male is different and independent from the scores of female.

Answer 16

b.

Expert Solution

Answer 17

b.

Expert Solution

Answer 18

Expert Solution

Answer 19

To determine

Identify the situation that has paired data.

Answer 20

Answer to Problem 1E

The data is not paired.

Answer 21

Explanation of Solution

Given info:

The data represents the scores of the males and females students.

Justification:

The scores of the male and female studentswere not pairedbecause the scores of the male is different and independent from the scores of female.

Answer 22

c.

Expert Solution

To determine

Identify the situation that has paired data.

Answer to Problem 1E

The data is analyzed as paired.

Explanation of Solution

Given info:

The data represents on selecting the group of freshmen to know the quality of the cafeteria at the beginning and a year later.

Justification:

The data taken from the students were paired because the survey was taken twice from the students. The response of the students was integrated.

Answer 23

c.

Expert Solution

Answer 24

c.

Expert Solution

Answer 25

Expert Solution

Answer 26

To determine

Identify the situation that has paired data.

Answer 27

Answer to Problem 1E

The data is analyzed as paired.

Answer 28

Explanation of Solution

Given info:

The data represents on selecting the group of freshmen to know the quality of the cafeteria at the beginning and a year later.

Justification:

The data taken from the students were paired because the survey was taken twice from the students. The response of the students was integrated.

Answer 29

Ch. 21.4 - Think about each of the situations described...Ch. 21.4 - Prob. 2JC Ch. 21.4 - Are parents equally strict with boys and girls? In...Ch. 21.4 - Prob. 4JC Ch. 21.4 - Prob. 5JC Ch. 21 - SECTION 18.1 1. Which method? Which of the...Ch. 21 - Prob. 2E Ch. 21 - SECTION 18.2 3. Cars and trucks We have data on...Ch. 21 - Prob. 4E Ch. 21 - Prob. 5E

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Answer to Problem 1E

Explanation of Solution

Answer to Problem 1E

Explanation of Solution

Answer to Problem 1E

Explanation of Solution

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Chapter 21 Solutions