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10 Nov 2021
Given information
The confidence level is 90% and the margin of error for the population proportions is 0.05. The task is to find the minimum sample size necessary.
Step-by-step explanation
Step 1.
The formula for the margin of error E for a population proportion is:
where 
is the probability of a success, 
, the probability of failure given by 
, 
is the necessary sample size and 
is the critical z score for a 90% confidence interval.
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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208
Solutions
Chapter
Section
- Problem 1a
- Problem 1b
- Problem 1c
- Problem 2
- Problem 3
- Problem 4
- Problem 5
- Problem 6a
- Problem 6b
- Problem 6c
- Problem 7
- Problem 8
- Problem 9
- Problem 10
- Problem 11
- Problem 12
- Problem 13a
- Problem 13b
- Problem 13c
- Problem 14
- Problem 15
- Problem 16
- Problem 17
- Problem 18
- Problem 19
- Problem 20
- Problem 21
- Problem 22
- Problem 23
- Problem 24
- Problem 25
- Problem 26
- Problem 27
- Problem 28
- Problem 29
- 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 43a
- Problem 43b
- Problem 43c
- Problem 43d
- Problem 44
- Problem 45
- Problem 46
- Problem 47
- Problem 48
- Problem 49a
- Problem 49b
- Problem 49c
- Problem 50
- Problem 51
- Problem 52
- Problem 53
- Problem 54
- Problem 55
- Problem 56a
- Problem 56b
- Problem 56c
- Problem 57
- Problem 58
- Problem 59
- Problem 60
- Problem 61
- Problem 62
- Problem 63
- Problem 64a
- Problem 64b
- Problem 64c
- 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
- Problem 78
- Problem 79
- Problem 80
- Problem 81a
- Problem 81b
- Problem 81c
- Problem 82
- Problem 83
- Problem 84
- Problem 85
- Problem 86
- Problem 87
- Problem 88a
- Problem 88b
- Problem 88c
- Problem 89
- Problem 90
- Problem 91
- Problem 92
- Problem 93
- Problem 94