So this z value, and the z value here is 1.6, and the next digit is 5. 1.65. So this critical z value is equal to 1.65. So the probability of getting a z value less than 1.65, or even in a completely normalized normal distribution, the probability of getting a value less than 1.65, or in any normal distribution, the probability of being less than 1.65 standard deviations away from the mean is going to be 95%. So that's our critical z value. Now, the z value, or the z statistic for our actual sample, is 2.14. Our actual z value we got is 2.14.