The t statistic is going to be 17.17, our sample mean, minus the assumed population mean, minus 20 parts per million, over our sample standard deviation, 2.98. This is really the definition of the t statistic. Hopefully, we see now that this really comes from a z score. The t distribution is kind of an engineered version of the normal distribution using t statistics. 2.98 divided by the square root of our sample size. We have 10 samples, so it's divided by the square root of 10. This value right here, let me get the calculator out just to get a value in place there.