STATISTICAL TECHNIQUES AND TOOLS
SAMPLING DISTRIBUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A 90% confidence interval for the mean speed driven by cars on East Main St. is given by (21, 45). What was the sample mean of this study?
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12
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24
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33
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None of these.
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Explanation:
Detailed explanation-1: -To find the sample size, we need to find the z-score for the 90% confidence interval. This means that we need to find the z-score so that the entire area to the left of z is 0.90+1−0.902=0.95 0.90 + 1 − 0.90 2 = 0.95 . So z=1.6.
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