A PSYC2010 lecturer asked ten students how useful they believe statistics are at the start of the semester (before taking PSYC2010) and then again at the end of the semester (after taking PSYC2010). The rating scale ranged from 1 (not useful) to 10 (extremely useful). The data, which were skewed, are provided below: Student Before PSYC2010 After PSYC2010 1 8 7 2 9 5 3 6 6 4 7 4 5 6 8 6 10 5 7 6 4 8 7 4 9 7 6 10 5 7 What is the value for T obtained? A) 9 B) 45 C) 8 D) 37 What is the T critical value? A) 11 B) 5 C) 8 D) 6 What was the N used to determine the critical value? A) 9 B) 10 C) 18 D) 20 What is the statistical decision? A) T obtained > T critical, therefore reject H0 B) T obtained > T critical, therefore retain H0 C) T obtained < T critical, therefore retain H0 D) T obtained = T critical, therefore reject H0 What is the interpretation? A) A Wilcoxon’s signed-rank test found a significant difference in perceived usefulness of statistics before and after taking PSYC2010, such that students perceived statistics to be more useful after taking PSYC2010 compared to before. B) A Wilcoxon’s signed-rank test found no significant difference in perceived usefulness of statistics before and after taking PSYC2010. C) A Wilcoxon’s signed-rank test found a significant difference in perceived usefulness of statistics before and after taking PSYC2010, such that students perceived statistics to be more useful after taking PSYC2010 compared to before. D) Cannot tell from the data provided. If the data were normally distributed, what would be an appropriate test to use in this example? A) Repeated measures t-test B) Independent groups t-test C) Single-sample t-test D) Chi-square goodness of fit test

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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Question

A PSYC2010 lecturer asked ten students how useful they believe statistics are at the start of the semester (before taking PSYC2010) and then again at the end of the semester (after taking PSYC2010). The rating scale ranged from 1 (not useful) to 10 (extremely useful). The data, which were skewed, are provided below:

Student	Before PSYC2010	After PSYC2010
1	8	7
2	9	5
3	6	6
4	7	4
5	6	8
6	10	5
7	6	4
8	7	4
9	7	6
10	5	7

What is the value for T obtained?
A) 9
B) 45
C) 8
D) 37

What is the T critical value?
A) 11
B) 5
C) 8
D) 6

What was the N used to determine the critical value?
A) 9
B) 10
C) 18
D) 20

What is the statistical decision?
A) T obtained > T critical, therefore reject H₀B) T obtained > T critical, therefore retain H₀C) T obtained < T critical, therefore retain H₀D) T obtained = T critical, therefore reject H₀

What is the interpretation?
A) A Wilcoxon’s signed-rank test found a significant difference in perceived usefulness of statistics before and after taking PSYC2010, such that students perceived statistics to be more useful after taking PSYC2010 compared to before.
B) A Wilcoxon’s signed-rank test found no significant difference in perceived usefulness of statistics before and after taking PSYC2010.
C) A Wilcoxon’s signed-rank test found a significant difference in perceived usefulness of statistics before and after taking PSYC2010, such that students perceived statistics to be more useful after taking PSYC2010 compared to before.
D) Cannot tell from the data provided.

If the data were normally distributed, what would be an appropriate test to use in this example?
A) Repeated measures t-test
B) Independent groups t-test
C) Single-sample t-test
D) Chi-square goodness of fit test

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