Let\'s assume that before your experiment, you decide that your confidence level

Question

Let's assume that before your experiment, you decide that your confidence level will be set to 95% - that is, you want to be at least 95% sure that the difference you observe between your two samples is not due to chance, and that they are, in fact, different.

You enter your measurements into the Excel spreadsheet provided, and it computes a t-test P value of 0.02

What does this mean? Are you confident that the two samples you are comparing are significantly different?

a. Yes they are diffferent

b. They are not significantly different

Explanation / Answer

The significance level, = 1 - confidence level = 1 - 0.95 = 0.05
P-value = 0.02

If the p-value is less than the significance level, we are at least 95% sure that the difference we observe between the two samples is not due to chance, and that they are, in fact, different.

Here, p-value = 0.02 < 0.05, Therefore we conclude,
a. Yes they are diffferent  

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