The following table lists the number of pages in four different types of magazines.
home decorating
news
health
computer
172
87
82
104
286
94
153
136
163
123
87
98
205
106
103
207
197
101
96
146
Using a significance level of 5%, test the hypothesis that the four magazine types have the same mean length.
:
Alternate Hypothesis: At least one pair of means is different
;
8.69
0.0012
Decision: Reject null; Conclusion: There is sufficient evidence to conclude that the mean lengths are different.
Eliminate one magazine type that you now feel has a mean length different than the others. Redo the hypothesis test, testing that the remaining three means are statistically the same. Use a new solution sheet. Based on this test, are the mean lengths for the remaining three magazines statistically the same?
Which two magazine types do you think have the same variance in length?
Which two magazine types do you think have different variances in length?
A researcher wants to know if the mean time (in minutes) that people watch their favorite news station are the same. Suppose that the table below shows the results of a study.
CNN
FOX
Local
45
15
72
12
43
37
18
68
56
38
50
60
23
31
51
35
22
Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.
df(n) = 2; df(d) = 14
4.08
0.0401
Reject the null hypothesis
There is sufficient evidence to conclude that the mean times are different.
Are the means for the final exams the same for all statistics class delivery types? The table below shows the scores on final exams from several randomly selected classes that used the different delivery types.
Online
Hybrid
Face-to-Face
72
83
80
84
73
78
77
84
84
80
81
81
81
86
79
82
Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.
Are the mean number of times a month a person eats out same for whites, blacks, Hispanics and Asians? Suppose that the table below shows the results of a study.
White
Black
Hispanic
Asian
6
4
7
8
8
1
3
3
2
5
5
5
4
2
4
1
6
6
7
Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.
df(n) = 3; df(d) = 15
0.8853
0.4711
Do not reject the null hypothesis
There is insufficient evidence to conclude that the mean number of times are different.
Are the mean number of daily visitors to a ski resort the same for the three types of snow conditions? Suppose that the table below shows the results of a study.
Powder
Machine Made
Hard Packed
1210
2107
2846
1080
1149
1638
1537
862
2019
941
1870
1178
1528
2233
1382
Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.
Is the variance for the amount of money, in dollars, that shoppers spend on Saturdays at the mall the same as the variance for the amount of money that shoppers spend on Sundays at the mall? Suppose that the table below shows the results of a study.
Saturday
Sunday
75
44
62
137
18
58
0
82
150
61
124
39
94
19
50
127
62
99
31
141
73
60
118
73
89
Assume that both distributions are normal. Use a level of significance of 0.05.
df(n) = 11; df(d) = 12
1.35
0.6090
Do not reject the null hypothesis
There is insufficient evidence to conclude that the variances are different.
Are the variances for incomes on the East Coast and the West Coast the same? Suppose that the table below shows the results of a study. Income is shown in thousands of dollars.
East
West
38
71
47
126
30
42
82
51
75
44
52
90
115
88
67
Assume that both distributions are normal. Use a level of significance of 0.05.
**Exercises 11 - 16 were contributed by Dr. Larry Green
Questions & Answers
I'm interested in biological psychology and cognitive psychology
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
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miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
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Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
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OpenStax, Collaborative statistics homework book: custom version modified by r. bloom. OpenStax CNX. Dec 23, 2009 Download for free at http://legacy.cnx.org/content/col10619/1.2
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