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The calcium content of a person’s urine was determined on two different days to be: Day           ...

The calcium content of a person’s urine was determined on two different days to be:

Day            Average Ca (mg L-1)            Number of Measurements

1               238                                   4

2               268                                   5

The analytical method used was known to have a standard deviation of 14 mg L-1 based on many trials. Are the two averages above significantly different at the 95% confidence level?

Math   Statistics-And-Probability   
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Conclusion: The two averages are significantly different at the 95% confidence level.

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