Question

Listed below are time intervals (min) between eruptions of a geyser. Assume that the "recent" times are within the past few years, the "past" times are from around 20 years ago, and that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Does it appear that the mean time interval has changed? Is the conclusion affected by whether the significance level is 0.10 or 0.01? Recent 79 91 89 80 56 101 63 87 69 89 83 84 56 80 73 103 62 Past 89 89 93 94 65 86 84 92 88 91 88 91 Let mu1 be the recent times and let mu2 be the past times. What are the null and alternative hypotheses? Find the test statistic and the P values?

Answer #1

steps on STATCRUNCH
Listed below are time intervals (min) between eruptions of a
geyser. Assume that the "recent" times are within the past few
years, the "past" times are from around 20 years ago, and that
the two samples are independent simple random samples selected from
normally distributed populations. Do not assume that the population
standard deviations are equal. Does it appear that the mean time
interval has changed? Is the conclusion affected by whether the
significance level is 0.10...

Listed below are time intervals (min) between eruptions of a
geyser. The "recent" times are within the past few years, and
the "past" times are from 1995. Does it appear that the variation
of the times between eruptions has changed? Use a 0.05
significance level. Assume that the two populations are normally
distributed.
77
86
90
91
91
93
76
96
57
62
101
87
62
89
90
92
69
84
92
95
84
86
81
96

#10 The following are the interval times (minutes) between
eruptions of a geyser. Detemine the five number summary and
construct a box plot from the data below.
81 83 85 86 87 90 91 93 94 94 98 98 99 101 101 103
The 5-number summary is _____

The following are the interval times? (minutes) between
eruptions of a geyser. Detemine the five number summary and
construct a box plot from the data below.
83?84??85???87??89??90??91??92??94??97???97??98???99???104??106?109
The number 5 summary is?

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...

DHL recently selected a random sample of packages and weigh
them. The weights for the samples are given below.
Use Excel to develop a frequency distribution using classes
having equal widths.
Use Excel to develop a relative frequency and a cumulative
relative frequency distribution for the weights using the same
classes created in part b.
What percent of the sampled crates have weights greater than 96
pounds?
DHL
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83
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80
88...

Since we are attempting to examine the behavior of a class of
students, the behavior of an individual (as we calculated in
objective 1) is really of little concern to us. Assuming that there
are 30 students enrolled for a typical class, use the central limit
theorem to calculate the following:
• What would be the shape of the
distribution of the average class grade of these 30 students?
• What would be the average class
average of...

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
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74
75
97
75
62
76
76
76
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76
77
57
77
98
77
63
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81
92
81
93
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83
83
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83
83
83
84
84
84...

TestScore
53
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84...

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...

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