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30 Nov 2021
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Suppose a statistics instructor believes that there is no significant difference between the mean class scores of statistics day students on Exam 2 and statistics night students on Exam 2. She takes random samples from each of the populations.
The mean and standard deviation for 35 statistics day students were 
and 
, respectively. The mean and standard deviation for 
statistics night students were 
and 
. The “day” subscript refers to the statistics day students.
and , respectively. The mean and standard deviation for statistics night students were and . The “day” subscript refers to the statistics day students.Step-by-step explanation
Step 1.
Note that the statistics instructor considers that there isn't enough evidence between the mean of statistics day on Exam 2 and statistics night on Exam 
, the class scores of the mean of statistics day on Exam 2 and statistics night on Exam aren't comparable.
Hence, two-tailed is the alternate theory.
The following is an alternative hypothesis:
The answer is the option 
.
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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208
Solutions
Chapter
Section
- Problem 78
- Problem 79
- Problem 80
- Problem 81
- Problem 82
- Problem 83
- Problem 84
- Problem 85
- Problem 86
- Problem 87
- Problem 88
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- Problem 90
- Problem 91
- Problem 92
- Problem 93
- Problem 94
- Problem 95
- Problem 96
- Problem 97
- Problem 98
- Problem 99
- Problem 100
- Problem 101
- Problem 102
- Problem 103
- Problem 104
- Problem 105
- Problem 106
- Problem 107
- Problem 108
- Problem 109
- Problem 110
- Problem 111
- Problem 112
- Problem 113
- Problem 114
- Problem 115
- Problem 116
- Problem 117
- Problem 118
- Problem 119
- Problem 120
- Problem 121
- Problem 122
- Problem 123