Question 1
A polling organization wants to reduce the margin of error in a survey without changing the confidence level. Which action would achieve this?
Medium - Quiz 1
Dive deeper into margin of error, confidence intervals, sample-to-population estimates, and how sampling method affects what conclusions you can draw.
Question 1 of 5
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A researcher surveys a random sample of city residents and reports a 95% confidence interval of (24, 32) for the mean commute time in minutes. Which of the following is the correct interpretation?
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A market research firm surveys a random sample of 200 residents in a city of 50,000. In the sample, 40% prefer Brand A, with a margin of error of 5 percentage points. Which of the following is a reasonable estimate for the number of city residents who prefer Brand A?
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A television network posts an online poll asking viewers to vote on their favorite show. Over 10,000 people respond. A statistics student says the results may not represent all viewers of the network. What is the best reason for the student's concern?
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A biologist captures a random sample of 150 fish from a lake and finds that 36 of them are bass. If the lake contains an estimated 2,500 fish, approximately how many bass are in the lake?