One disadvantage of this approach is that when a firm decision is not being made to retain or reject the null hypothesis, it is difficult to deal with the concept of type I and (6) _____________ ___ errors.

Results of hypotheses are often described as having statistical significance if the (7)____________ hypothesis has been rejected. Statistical significance indicate that the null hypothesis is probably false, but doesn't indicate whether it is seriously false or mildly false. Statistical significance may lack practical importance because sample size is (8)__________________________.

One way to judge practical importance when large sample sizes are present is to use the squared (9)____________________________________ correlation. The squared point biserial correlation indicates the proportion of variance in the dependent variable that is predictable from the (10)_________________________ variable. Cohen suggested a rule of thumb for interpreting the values of squared point correlation in relation to effect size. However, it is best not to apply any rule of thumb without considering special circumstances that could make even a very small effect very important.

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