QUESTION 6 6.29b: Provide the upper limit of the confidence interval. Use 2 decimals for your answer. Hint: See L-15 pdf and lecture, page 8-11 (Exercise 6.11)
QUESTION 6 6.29b: Provide the upper limit of the confidence interval. Use 2 decimals for your answer. Hint: See L-15 pdf and lecture, page 8-11 (Exercise 6.11)
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Transcribed Image Text:QUESTION 6
6.29b: Provide the upper limit of the confidence interval. Use 2 decimals for your
answer.
Hint: See L-15 pdf and lecture, page 8-11 (Exercise 6.11)
Transcribed Image Text:6.29 A study was designed to measure the effect of home environment on academic achieve-
ment of 12-year-old students. Because genetic differences may also contribute to academic
achievement, the researcher wanted to control for this factor. Thirty sets of identical twins were
identified who had been adopted prior to their first birthday, with one twin placed in a home in
which academics were emphasized (Academic) and the other twin placed in a home in which
academies were not emphasized (Nonacademic). The final grades (based on 100 points) for the 60
students are given here.
Set of
Set of
Twins
Academic
Nonacademic
Twins
Academic
Nonacademic
1
78
71
16
90
88
2
75
70
17
89
80
3
68
66
18
73
65
92
85
19
61
60
55
60
20
76
74
74
72
21
81
76
7
65
57
22
89
78
8
80
75
82
78
98
92
70
62
10
68
73
11
67
63
74
73
12
55
52
85
75
13
49
48
28
97
88
14
95
94
15
75
70
30
78
75
a. Is there a difference in the mean final grades between the students in an academi-
cally oriented home environment and those in a nonacademically oriented home
environment. Use a- 05.
b. Estimate the size of the difference in the mean final grades of the students in
academic and nonacademic home environments using a 95% confidence interval.
c. Do the conditions for using the procedures appear to be satisfied for these data?
d. Does it appear that using twins in this study to control for variation in final scores
was effective as compared to taking a random sample of 30 students in both types
of home environments? Justify your answer.
Act
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