Given information
Use the following information for the next five exercises. Two types of phone operating systems are being tested to determine if there is a difference in the proportions of system failures (crashes). Fifteen out of a random sample of 
phones with 
had system failures within the first eight hours of operation. Nine out of another random sample of phones with 
had system failures within the first eight hours of operation. is believed to be more stable (have fewer crashes) than .
Step-by-step explanation
The test is at 
level of significance that is 
.
The output from the exercise 
is given below,
The decision is if 
, then not to reject the null hypothesis.
At level of significance, there is not sufficient evidence to reject the null hypothesis, so the data do not show that has fewer system failures than .
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Introductory Statistics
Solutions
Chapter
Section
- Problem 1
- Problem 2
- Problem 3
- Problem 4
- Problem 5
- Problem 6
- Problem 7
- Problem 8
- Problem 9
- Problem 11
- Problem 12
- Problem 13
- Problem 14
- Problem 15
- Problem 16
- Problem 17
- Problem 18
- Problem 19
- Problem 20a
- Problem 20b
- Problem 21
- Problem 22
- Problem 23
- Problem 24
- Problem 25
- Problem 26
- Problem 27
- Problem 28
- Problem 29a
- Problem 29b
- Problem 30
- Problem 31
- Problem 32
- Problem 33
- Problem 34
- Problem 35
- Problem 36
- Problem 37
- Problem 38
- Problem 39
- Problem 40
- Problem 41
- Problem 42
- Problem 43
- Problem 44
- Problem 45
- Problem 46
- Problem 47
- Problem 48
- Problem 49
- Problem 50
- Problem 51
- Problem 52a
- Problem 52b
- Problem 53
- Problem 54
- Problem 55
- Problem 56
- Problem 57
- Problem 58
- Problem 59
- Problem 60
- Problem 61
- Problem 62
- Problem 63
- Problem 64
- Problem 65
- Problem 66
- Problem 67
- Problem 68
- Problem 69
- Problem 70
- Problem 71
- Problem 72
- Problem 73
- Problem 74
- Problem 75
- Problem 76
- Problem 77