Exam 7: Making Sense of Statistical Significance: Effect Size and Statistical Power

Reviews of a collection of studies on a particular topic that use meta-analyses represent an alternative to traditional __________ articles. These traditional articles describe and evaluate each study and then attempt to draw some overall conclusion.

The __________ of a study is the difference in the population means divided by the population SD.

In order to convert a raw score effect size to a standardized effect size, one should:

What effect will using a one-tailed test over a two-tailed test have on power (presuming the true population difference is in the expected direction)?

The effect size of a study is a good indicator of its practical importance because, unlike statistical significance, it is not affected by __________.

What is the most likely explanation for why a study with a very small effect size came out significant?

According to Cohen's conventions, for research that compares means, a large effect size in which only about 53% of the populations of individuals overlap would be:

Jacob Cohen introduced to behavioral and social scientists some very important statistical tools that included all of the following EXCEPT:

Which of the following is NOT a correct statement about effect size of a study finding:

One important advantage of using effect sizes is that:

Effect Size = (Population 1M - Population 2M)/__________.

In a research study with an effect size of .20, the populations of individuals have an overlap of about:

Effect size is an important tool for making sense of research results because:

Effect size is one of the two major factors that contribute to power. Another factor is:

Aside from sample size, other influences on statistical power include __________ , __________ , and __________.

Some IQ tests have a standard deviation of 16 points. If an experimental procedure produced an increase of 3.2 IQ points, the effect size would represent a __________ effect size.

In the situation where the null hypothesis is true, the population distribution from which the sample was taken is:

If a study with only a few participants manages to be statistically significant, it probably had:

A researcher would use a __________ to combine results of several different studies, based on their effect sizes.

Increasing sample size __________ statistical power.