Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 23.6 with a standard deviation of 4.5, while the 200 students in group 2 had a mean score of 18.5 with a standard deviation of 4.1. Complete parts (a) and (b) below. (a) Determine the 90% confidence interval for the difference in scores, μ1−μ2. Interpret the interval. The lower bound is nothing. The upper bound is nothing. (Round to three decimal places as needed.) Interpret the interval. Choose the correct answer below. A. There is a 90% probability that the difference of the means is in the interval. B. The researchers are 90% confident that the difference of the means is in the interval. C. The researchers are 90% confident that the difference between randomly selected individuals will be in the interval. D. There is a 90% probability that the difference between randomly selected individuals will be in the interval. (b) What does this say about priming? A. Since the 90% confidence interval contains zero, the results suggest that priming does not have an effect on scores. B. Since the 90% confidence interval contains zero, the results suggest that priming does have an effect on scores. C. Since the 90% confidence interval does not contain zero, the results suggest that priming does have an effect on scores. D. Since the 90% confidence interval does not contain zero, the results suggest that priming does not have an effect on scores. Click to select your answer(s).

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The

200

students in group 1 had a mean score of

23.6

with a standard deviation of

4.5,

while the

200

students in group 2 had a mean score of

18.5

with a standard deviation of

4.1.

Complete parts (a) and (b) below.

(a) Determine the

90%

confidence interval for the difference in scores,

μ1−μ2.

Interpret the interval.

The lower bound is

nothing.

The upper bound is

nothing.

(Round to three decimal places as needed.)

Interpret the interval. Choose the correct answer below.

There is a

90%

probability that the difference of the means is in the interval.

The researchers are

90%

confident that the difference of the means is in the interval.

The researchers are

90%

confident that the difference between randomly selected individuals will be in the interval.

There is a

90%

probability that the difference between randomly selected individuals will be in the interval.

(b) What does this say about priming?

Since the

90%

confidence interval contains zero, the results suggest that priming does not have an effect on scores.

Since the

90%

confidence interval contains zero, the results suggest that priming does have an effect on scores.

Since the

90%

confidence interval does not contain zero, the results suggest that priming does have an effect on scores.

Since the

90%

confidence interval does not contain zero, the results suggest that priming does not have an effect on scores.

Click to select your answer(s).

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