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Confidence Intervals for a Proportion Flashcards | StudBud
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Confidence Intervals for a Proportion
Confidence Intervals for a Proportion
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StudBud Administration
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Probability and Statistics
Flashcards
6 cards
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Questions
6
Answers
1
From 120 people, 102 had at least one pet. Estimate proportion of people in the population that have at least one pet.
0.78
1.55
0.60
0.85
2
Which of these is the correct formula?
p̂±zₐ/2√(p̂-1[p̂]/n)
p±zₐ/2√(p[1-p]/n)
p̂±zₐ/2√(p̂[1-p̂]/n)
p±z/2√(p̂[1-p̂])
3
Which is the construction of a 95% confidence interval that estimates the population proportion: at least one pet owned?
Size of the sample is more than 5%, 12.6 is lesser than or equal to 10
Size of the sample is not more than 5%, 12.6 is greater than or equal to 10
Size of the sample is more than 5%, 15.3 is lesser than or equal to 10
Size of the sample is not more than 5%, 15.3 is greater than or equal to 10
4
Solve using p̂±zₐ/2√(p̂[1-p̂]/n)
Lower: 0.601, Upper: 0.814
Lower: 0.786, Upper: 0.914
Lower: 0.686, Upper: 0.915
Lower: 0.914, Upper: 0.601
5
You can be 95% confident the proportion of people in the population that owns at least one pet is between .786 and .914.
False
True
6
Confidence intervals do not give ALL possible values for a parameter.
False
True
