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).
