Sample size

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3.1

How is sample size related to statistical tests and outcomes? Give a specific example. Why is it important to plan the sample size before collecting data?

3.2

Fill in the following for a possible study with one independent variable (IV) with two conditions/treatments and a dependent variable (DV) that is measured on a continuous scale (interval or ratio):

· Independent variable = ______________

Condition A = ______________

Condition B = ______________

· Dependent variable = _______________

· How do you know this DV is measured on a continuous scale?

· Now, how would you word the null hypothesis for your sample study?

· How would you word the alternative hypothesis for your sample study?

· What alpha level would you set to test your hypothesis? Why?