Right-Tailed Test Why are the hypothesis tests described in this section always right-tailed, as in Example 1? Example 1 Contingency Table from Echinacea Experiment Table 11-6 is a contingency table...

Right-Tailed Test
Why are the hypothesis tests described in this section always right-tailed, as in Example 1?

Example 1

Contingency Table from Echinacea Experiment
Table 11-6 is a contingency table with two rows and three columns. The cells of the table contain frequencies. The row variable identifies whether the subjects became infected, and the column variable identifies the treatment group (placebo, 20% extract group, or 60% extract group).

Table 11-6 Results from Experiment with Echinacea