Textbook ExpertVerified Tutor
20 Dec 2021
Given information
The airline says that its flights are always on schedule, with a maximum delay of 15 minutes. The average delay, it maintains, is so consistent that the variance is less than 150 minutes. A unhappy traveller calculates the delays for his following 25 flights, doubting the claim's consistency. With a standard deviation of 15 minutes, the average delay for those 25 flights is 22 minutes.
Step-by-step explanation
Step 1.
This is a single variance test because the argument is that a single line creates less variation. The population variance, 
, or population standard deviation, 
, is the parameter.
Random Variable: The random variable is the sample standard deviation, . For the waiting times, let = standard deviation.
This is a left-tailed test, as the word "less" indicates.
Unlock all Textbook Solutions
Already have an account? Log in
Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208
Solutions
Chapter
Section
- Problem 69
- Problem 70
- Problem 71
- Problem 72
- Problem 73
- Problem 74
- Problem 75
- Problem 76
- Problem 77
- Problem 78
- Problem 79
- Problem 80
- Problem 81
- Problem 82
- Problem 83
- Problem 84
- Problem 85
- Problem 86
- Problem 87
- Problem 88
- Problem 89
- 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
- Problem 124
- Problem 125
- Problem 126
- Problem 127
- Problem 128
- Problem 129