## Handout 10.4

Experimental hypothesis:
Null hypothesis:

Independent variable:

Operational definition:

Dependent variable:

Operational definition:

What is the experimental group?

What is the control group?

How do we decide who goes in which group?

What would statistically significant results tell us?

If our results are statistically significant at the .05 level, what are our chances of making a Type 1 error?

If, instead of using a .05 level of significance, we used a .01 level of significance,

a. Would our chances of making a Type 1 error be less?

b. What about our chances of making a Type 2 error?

If we failed to find a statistically significant result, what could we conclude? Why?

What steps could we take to reduce the chances of making a Type 2 error? That is, what steps could we take to improve power?

Why does the simple experiment have more internal validity than a pretest-posttest design?

What steps could we take to increase external validity?

What steps could we take to increase construct validity?

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