What is the test statistic and how would we interpret it? The test statistic is . So, for a sample of this size, this particular sample was 3.2 standard deviations below the mean (266) on the distribution of sample means. The test statistic is . So, for a sample of this size, this particular sample was 1.975 standard deviations above the mean (266) on the distribution of sample means. The test statistic is . So, for a sample of this size, this particular sample was 3.2 standard deviations above the mean (266) on the distribution of sample means. The test statistic is . So, for a sample of this size, this particular sample was 1.975 standard deviations below the mean (266) on the distribution of sample means