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Issues in significance test

5 important questions on Issues in significance test

What is an effect size?

It provides information aabout the size differences between group means.

What is Cohen's D effect size

It describes a difference between means in numbers of standard deviations. It's a unit-free effect size that is not related to N, sample size.

What happens to t if N increases and d holding contstant?

T increases

What does the magnitude of a P value or the phrase statistically significant by it self say?

Nothing much, because you can't conclude something by the p value, you need more information

Which 3 factors that influence power for type II error?

1. as alpha increases, power decreases.
2. As sample size increases, risk for type II error power decreases and statistical power increases.
3. As population effect size such as Cohen's d increases, risk for type II error power decreases and statistical power increases.

The question on the page originate from the summary of the following study material:

Applied Statistics I Basic bivariate Techniques | 9781071807491 | Rebecca M warner

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