FORESTRY
AGRICULTURAL STATISTICS AND ECONOMICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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For a simple random sample of 100 cars of a certain popular model in 20012, it was found that 20 had a certain minor defect in the brakes. For an independent SRS of 400 cars of the same model in 2009, it was found that 50 had the same defect. Let p1 and p2 be the proportions of all cars of this model in 2012 and 2009, respectively, that have the defect. A 90% confidence interval for p1-p2 is (approximately)
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0.075 ± 0.085.
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0.075 ± 0.071
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0.075 ± 0.043
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0.075 ± 0.065
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Explanation:
Detailed explanation-1: -A simple random sample is obtained by randomly selecting individuals from a target population. Each individual in the target population (i.e. all students at the high school) should have an equal chance of being selected.
Detailed explanation-2: -"A simple random sample (SRS) of size n consists of n individuals from the population chosen in such a way that every set of n individuals has an equal chance to be the sample actually selected."1.
There is 1 question to complete.