STATISTICAL TECHNIQUES AND TOOLS
CONFIDENCE INTERVALS
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Question
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A researcher studying reaction time of drivers states that, “A 95% confidence interval for the mean time it takes for a driver to apply the brakes after seeing the brake lights on a vehicle in front of him is 1.2 to 1.8 seconds. What are the point estimate and margin of error for this interval?
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Point estimate = 1.2 seconds; margin of error = 0.6 seconds.
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Point estimate = 1.2 seconds; margin of error = 0.3 seconds.
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Point estimate = 1.5 seconds; margin of error = 0.6 seconds.
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Point estimate = 1.5 seconds; margin of error = 0.3 seconds.
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Explanation:
Detailed explanation-1: -A 95% confidence interval is a range of values (upper and lower) that you can be 95% certain contains the true mean of the population.
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