the final exam, the teacher had matched 9 students in the first section with 9 students in the second section based on their midterm grades. For example, a student in the no-change section with an 89 on the midterm exam was matched with student in the change section who also had an 89 on the midterm. The difference between the two final exam grades for each matched pair was computed and the data showed that the students who were allowed to change answers scoring higher by an average of M, = 7 points with SS = 288. a. Do the data indicate a significant difference between the two conditions? Use a two-tailed test with a = .05. b. Construct a 95% confidence interval to estimate the size of the population mean difference. c. Write a sentence demonstrating how the results of the hypothesis test and the confidence interval would appear in a research report.
the final exam, the teacher had matched 9 students in the first section with 9 students in the second section based on their midterm grades. For example, a student in the no-change section with an 89 on the midterm exam was matched with student in the change section who also had an 89 on the midterm. The difference between the two final exam grades for each matched pair was computed and the data showed that the students who were allowed to change answers scoring higher by an average of M, = 7 points with SS = 288. a. Do the data indicate a significant difference between the two conditions? Use a two-tailed test with a = .05. b. Construct a 95% confidence interval to estimate the size of the population mean difference. c. Write a sentence demonstrating how the results of the hypothesis test and the confidence interval would appear in a research report.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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
Transcribed Image Text:the final exam, the teacher had matched 9 students in
the first section with 9 students in the second section
based on their midterm grades. For example, a student
in the no-change section with an 89 on the midterm
exam was matched with student in the change section
who also had an 89 on the midterm. The difference
between the two final exam grades for each matched
pair was computed and the data showed that the
students who were allowed to change answers scoring
higher by an average of M,= 7 points with SS = 288.
a. Do the data indicate a significant difference
between the two conditions? Use a two-tailed test
with a = .05.
b. Construct a 95% confidence interval to estimate
the size of the population mean difference.
c. Write a sentence demonstrating how the results
of the hypothesis test and the confidence interval
would appear in a research report.

Transcribed Image Text:14. There is some evidence suggesting that you are likely
to improve your test score if you rethink and change
answers on a multiple-choice exam (Johnston, 1975).
To examine this phenomenon, a teacher gave the same
final exam to two sections of a psychology course. The
students in one section were told to turn in their exams
immediately after finishing, without changing any
of their answers. In the other section, students were
encouraged to reconsider each question and to change
answers whenever they felt it was appropriate. Before
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