Question

The test-retest method is one way of establishing the reliability of a test. The test is administered, and then, at a later date, the same test is re-administered to the same individuals. The correlation coefficient is computed between the two sets of scores. The following test scores were obtained in a test-retest situation. (Give your answers correct to two decimal places.)

First Score | 84 | 73 | 98 | 92 | 86 | 69 | 93 | 66 | 89 | 97 |

Second Score | 74 | 92 | 56 | 57 | 80 | 90 | 73 | 65 | 60 | 81 |

(a) Find *r*.

(b) Set a 95% confidence interval for *ρ*.

Lower Limit | _____ |

Upper Limit | _____ |

You may need to use the appropriate table in Appendix B to answer
this question.

Answer #1

The test-retest method is one way of establishing the
reliability of a test. The test is administered, and then, at a
later date, the same test is re-administered to the same
individuals. The correlation coefficient is computed between the
two sets of scores. The following test scores were obtained in a
test-retest situation. (Give your answers correct to two
decimal places.)
First Score
84
88
94
95
97
73
77
64
93
92
Second Score
59
64
59
53
73...

The test-retest method is one way of establishing the
reliability of a test. The test is administered, and then, at a
later date, the same test is re-administered to the same
individuals. The correlation coefficient is computed between the
two sets of scores. The following test scores were obtained in a
test-retest situation. (Give your answers correct to two decimal
places.)
First Score
87
95
70
72
77
93
88
82
86
73
Second Score
67
74
87
57
78...

The test-retest method is one way of establishing the
reliability of a test. The test is administered, and then, at a
later date, the same test is re-administered to the same
individuals. The correlation coefficient is computed between the
two sets of scores. The following test scores were obtained in a
test-retest situation. (Round your answers to two decimal
places.)
First Score
75
87
60
75
98
80
68
84
47
72
Second Score
71
91
51
76
93
77...

Test score of 40 students are listed below. Find the percentile for
the test score of 66.
30 35 43 44 47 48 54 55 56 57
59 62 63 65 66 68 69 69 71 72
72 73 74 76 77 77 78 79 80 81
81 82 83 85 89 92 93 94 97 98

Below represent scores on an exam, each entry one score for one
student
40
99
59
98
63
63
64
65
67
35
67
67
68
70
71
71
71
46
72
72
60
73
74
74
74
75
97
75
62
76
76
76
76
76
77
57
77
98
77
63
78
78
78
79
79
80
80
80
80
80
81
81
92
81
93
82
82
83
83
83
83
83
83
83
84
84
84...

The test scores of 40 students are listed below.
30
35 43 44 47 48 54 55 56 57
59
62 63 65 66 68 69 69
71 72
72
73 74 76 77 77 78 79 80 81
81 82 83 85 89
92 93 94 97
98
a)
Find the lower and upper quartiles for the data.
b)
Find the interquartile range.
c)
Draw the box-and-whisker diagram for the data.

Student Grades
Student
Test
Grade
1
76
62
2
84
90
3
79
68
4
88
84
5
76
58
6
66
79
7
75
73
8
94
93
9
66
65
10
92
86
11
80
53
12
87
83
13
86
49
14
63
72
15
92
87
16
75
89
17
69
81
18
92
94
19
79
78
20
60
71
21
68
84
22
71
74
23
61
74
24
68
54
25
76
97...

Use ? to approximate σ. Use a 5% level of significance.
Data:
69
62
75
66
68
57
61
84
61
77
62
71
68
69
79
76
87
78
73
89
81
73
64
65
73
69
57
79
78
80
79
81
73
74
84
83
82
85
86
77
72
79
59
64
65
82
64
70
83
89
69
73
84
76
79
81
80
74
77
66
68
77
79
78
77

Refer to the accompanying data set and construct a 95%
confidence interval estimate of the mean pulse rate of adult
females; then do the same for adult males. Compare the results.
Males Females
81
82
72
94
52
57
59
66
51
54
62
80
52
77
74
85
51
89
62
57
73
35
61
64
62
87
80
74
80
79
63
62
63
67
97
76
43
60
85
65
72
86
66
85
73
69
72 ...

The Test Scores for a Statistics course are given in the Excel
below.
The data (X1, X2, X3, X4) are for each student.
X1 = score on exam #1
X2 = score on exam #2
X3 = score on exam #3
X4 = score on final exam
Your professor wants to know if all tests are created equal.
What is the F-Stat?
EXAM1
EXAM2
EXAM3
FINAL
73
80
75
65.86667
93
88
93
80.16667
89
91
90
78
96
98...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 30 minutes ago

asked 39 minutes ago

asked 49 minutes ago

asked 49 minutes ago

asked 50 minutes ago

asked 51 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago