The next thing we have to think about is what type of distribution we should think about. The first thing that rings in my brain is we only have 10 samples here. We have a small sample size right over here. We're going to be dealing with a t distribution and a t statistic. With that said, let's think of it this way. We can come up with a t statistic that is based on these statistics right over here. 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.