Question 1105643: Statistics students participated in an experiment to test their ability to determine when 1 minute (or 60 seconds) has passed. The results are given below in seconds. Find the range, variance, and standard deviation for the given sample data. Identify one reason why the standard deviation from this sample might not be a good estimate of the standard deviation for the population of adults.
51,53,60,69,56
I KNOW THE RANGE IS 18 SECONDS
BUT NEED HELP WITH SAMPLE VARIANCE
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! Mean is 57.8
the variance is the sum of squares of the differences divided by 4, calling this a sample and not a population
-6.8^2+-4.8^2+2.2^2+11.2^2-1.8^2=202.8/4=50.7; sd is sqrt of that.
Reasons why this sd might not be a good estimate:
1. Small sample size
2. Youth (likely), with different memory.
3. Students, so those without same education may not be the same.
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