Research Methods for the Behavioral Sciences (MindTap Course List)
5th Edition
ISBN: 9781305104136
Author: Frederick J Gravetter, Lori-Ann B. Forzano
Publisher: Wadsworth Publishing
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Chapter 8, Problem 8E
Explain how holding a participant variable such as gender constant prevents the variable from becoming a confounding variable and can help reduce the variance within treatments.
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Section 10-2 Homework Assignment
Section 10-2 Homework Assignment
Question 4 of 8 (1 point) | Question Attempt: 1 of Unlimited
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A ALEKS-Mariana Quezada - Section 10-2 Ho
Final grades The data show the final grades for 16 randomly selected students in College Algebra and Statistics. Find the y-value for the specified x-value.
Remember that no regression should be done when r is not significant.
Student
1
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8
College Algebra
78
85
81
90
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70
84
59
Statistics
80
95
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Student
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College Algebra
84
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77
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Statistics
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The correlation coefficient for the data is r=0.626and a=0.05 Should regression analysis be done?
The regression analysis should not be done.
The regression analysis should be done.
Find the equation of the regression line. Round the coefficients to at least three decimal places.
y'-a+bx
b=
Find the predicted grade in Statistics when the…
Hours Watching Videos and GPA The data show a random selection of students' GPAs and the number of hours per week
that they spend watching videos. Is there a linear relationship between the two variables?
Student 1 2
3
4
5
6 7 8 9 10 11 12
Hours
GPA
5 6 7
8
9
10
13 15 16 20 22 25
4.0 3.9 3.7 3.6 3.4 3.3 3.2 2.9 2.7 2.4 2.2 2.1
Send data to Excel
Part 1 of 5
(a) Draw the scatter plot for the variables.
Time Watching Videos and GPA
4
3.5-
3-
2.5
1.5-
1+
0.5+
0
10
15
Hours watching videos
35
Part 2 of 5
(b) Compute the value of the correlation coefficient. Round your answer to at least three decimal places.
r-1.003
Part 3 of 5
(c) State the hypotheses.
Hop-o
Hp 0
Part: 3/5
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8- Write down the definition of a "pseudo distribution function" and state (without proof) the
Helly's selection theorem.
Chapter 8 Solutions
Research Methods for the Behavioral Sciences (MindTap Course List)
Ch. 8.1 - Describe, compare, and contrast the defining...Ch. 8.1 - Explain the general advantages and disadvantages...Ch. 8.2 - Define individual differences and explain how...Ch. 8.3 - Identify the three primary techniques for limiting...Ch. 8.4 - Describe how individual differences influence...Ch. 8.4 - Identify the options for reducing or controlling...Ch. 8.5 - Describe how differential attrition and...Ch. 8.6 - Describe how between-subjects designs are used to...Ch. 8 - In addition to the key words, you should also be...Ch. 8 - Identify the basic features of a between-subjects...
Ch. 8 - In a between-subjects design, each individual...Ch. 8 - Briefly explain how a participant characteristic,...Ch. 8 - Briefly explain how random assignment attempts to...Ch. 8 - Explain the advantages and disadvantages of using...Ch. 8 - Briefly explain why large variance within...Ch. 8 - Explain how holding a participant variable such as...Ch. 8 - Explain how holding a participant variable such as...Ch. 8 - Describe some of the problems that can arise when...Ch. 8 - Describe the advantages of a two-group design...Ch. 8 - A researcher has a sample of 30 rats that are all...Ch. 8 - A recent survey at a major corporation found that...
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