Question
Suppose the previous mean exam score was 70. We would like to know whether or not...
Suppose the previous mean exam score was 70. We would like to know whether or not the mean score has increased.
Answer the following question using any approximate method by stating the necessary assumptions.
The data are here:
75 70 88 80 80 66 65 68 85 80 78 72 69 75 86 96 77 81 76 80
66 65 78 87 88 75 85 84 66 78 76 74 85 64 76 75 76 74 81 76
(a) State the null and alternative hypothesis, and carry out the
hypothesis test using the significance level of 0.05.
(b) Construct a 90% confidence interval for the mean score.
a and b please
Homework Answers
Answer #1
Assumptions:
(We use t test for single mean)
Let the sample drawn be simple random sample.
The sample data are independent.
The sample size is less than 30 .
Population standard deviation is unknown.
Not the answer you're looking for?
Similar Questions
Below represent scores on an exam, each entry one score for one student 40 99 59...
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...
Mid Score Final Score 80 78 87 85 72 81 69 54 86 70 83 73...
Mid Score
Final Score
80
78
87
85
72
81
69
54
86
70
83
73
78
89
75
84
74
86
75
79
84
75
73
63
74
72
73
69
80
86
75
78
72
75
77
68
76
77
66
78
74
77
71
73
85
79
74
74
76
79
76
73
84
72
77
81
78
86
86
76
81
83
78
83
85
86
73
71
83
83
83
79
72
68
83
90...
TestScore 53 53 56 56 56 58 58 58 59 59 59 60 60 62 63...
TestScore
53 53 56 56 56 58 58 58 59 59 59 60 60 62 63 63 63 64 65 65 66
67 67 67 67 68 69 69 69 69 71 71 72 72 72 72 73 73 73 73 73 74 75
75 75 76 76 76 76 77 77 77 77 77 78 78 78 79 79 79 79 80 80 80 80
80 80 81 81 81 82 82 83 83 83 83 84 84 84...
Consider the below vector x, which you can copy and paste directly into Matlab. The vector...
Consider the below vector x, which you can copy and
paste directly into Matlab. The vector contains the final grades
for each student in a large linear algebra course.
x = [61 52 63 58 66 92 64 55 76 60 70 78 76 73 45 63
97 70 100 76 50 64 42 100 67 81 81 59 68 62 72 99 66 76 81 59 47 84
67 75 63 86 73 44 51 69 48 74 61...
TestScore 53 53 56 56 56 58 58 58 59 59 59 60 60 62 63...
TestScore
53
53
56
56
56
58
58
58
59
59
59
60
60
62
63
63
63
64
65
65
66
67
67
67
67
68
69
69
69
69
71
71
72
72
72
72
73
73
73
73
73
74
75
75
75
76
76
76
76
77
77
77
77
77
78
78
78
79
79
79
79
80
80
80
80
80
80
81
81
81
82
82
83
83
83
83
84
84
84...
have a java application need to create an application which is able to do some analysis...
have a java application need to create an application which is
able to do some analysis on temperature data stored in a data file.
You will be given the “temperatures.dat” data file which contains
the data you must analyze. The analysis you’ll need to do is:
Total number of data points
Find coldest temperature
Find warmest temperature
Find average temperature
Find the frequency of each temperature
Find the most frequent temperature
Find the least frequent temperature
All classes must be...
Use ? to approximate σ. Use a 5% level of significance. Data: 69 62 75 66...
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
The Test Scores for a Statistics course are given in the Excel below. The data (X1,...
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...
Using the accompanying Student Grades data, construct a scatter chart for midterm versus final exam grades...
Using the accompanying Student Grades data, construct a scatter
chart for midterm versus final exam grades and add a linear
trendline. What is the model? If a student scores 7878 on the
midterm, what would you predict her grade on the final exam to
be?
Student
Midterm
Final Exam
1
75
64
2
85
91
3
80
68
4
88
83
5
76
60
6
67
80
7
78
74
8
95
94
9
67
61
10
93
87
11...
Question 1: Table 1 shows the number of customers visited by a salesman over an 80-week...
Question 1: Table 1 shows the number of customers visited by a
salesman over an 80-week period. Table 1: Customers Visited Over an
80-Week Period 68 64 75 82 68 60 62 88 76 93 73 79 88 73 60 93 71
59 85 75 61 65 75 87 74 62 95 78 63 72 66 78 82 75 94 77 69 74 68
60 96 78 89 61 75 95 60 79 83 71 79 62 67 97 78...
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 18 minutes ago
asked 27 minutes ago
asked 30 minutes ago
asked 31 minutes ago
asked 39 minutes ago
asked 45 minutes ago
asked 49 minutes ago
asked 53 minutes ago
asked 54 minutes ago
asked 57 minutes ago
asked 1 hour ago
asked 1 hour ago