Suppose you carry out a 2-group experiment that is modelled on a previous study.

Question

Suppose you carry out a 2-group experiment that is modelled on a previous study.
Everything in your experimental design is the same as in the previous study, EXCEPT that you have used a larger sample size in the new study.

Which of the following outcomes would you expect from the new study.
(Note: You must select ALL and ONLY the correct choices to get a mark for this question.)
Answer


a. the pooled within-groups variance should be larger in my new study

b. my new study should have more power

c. the t-statistic should be larger in my new study

d. the effect size (e.g., Cohen's d) should be larger in my new study

e. the standard error of the difference between means should be larger in my new study.

Explanation / Answer

When using large sample size in the study without changing the experimental design, the following are true. a. the pooled within-groups variance should be larger in my new study b. my new study should have more power c. the t-statistic should be larger in my new study

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