Again, if you click on this link that pops up when you start entering the formula,

Excel will explain a little bit more about what those last two values mean.

But what we end up with after running the t-test is this value.

Ours is 0.001.

That's the probability that the difference between these two means is due to chance.

In other words, there's a one-tenth of 1% chance that this is

simply random difference between the time to log in with the PIN and

the time to log in with a biometric.

That's a pretty small probability.

In general for a t-test, if this number is less than 0.05,

you can say there's a significant difference between the means.

If it's greater than 0.05, you can't say there's a significant difference.

What that means is there has to be no more than a 5% chance

that the difference between those means is just random.

In this case, our result is 0.001, which is a lot smaller than 0.05,

so we can say we have a significant difference.

Once you've done your analysis, you report your results.