Problem-Solving and Data AnalysisEasy–MediumSample estimate from an interval
Problem-Solving and Data Analysis practice question
A survey based on a random sample reports that a plausible range for the mean weekly grocery spending of all households in a town is $48 to $56. What is the sample's estimate of the mean, in dollars?
Answer: 52
The sample estimate is the centre of the interval: (48 + 56)/2 = 52. The margin of error is 4 either side.
Common wrong answers
- If you answered 4
- 4 is the margin of error, not the estimate.
- If you answered 8
- 8 is the width of the interval.
- If you answered 56
- 56 is the top of the interval, not its centre.
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