This level of significance is the alpha error and is marked in Figure 9.2 as the shaded areas in each tail of the \(H_0\) distribution. (Each area is actually \(\alpha/2\) because the distribution is ...This level of significance is the alpha error and is marked in Figure 9.2 as the shaded areas in each tail of the \(H_0\) distribution. (Each area is actually \(\alpha/2\) because the distribution is symmetrical and the alternative hypothesis allows for the possibility for the value to be either greater than or less than the hypothesized value--called a two-tailed test).
