Chapter 8 Mastery Quiz Flashcards
A Cohen’s d of –0.85 is what type of effect size?
large
A Cohen’s d value of 0.2 indicates how much overlap between distributions?
85 percent
The _____ estimate acknowledges the amount of uncertainty in the _____ estimate by reporting the margin of error.
interval; point
Power can be thought of as the percentage of the distribution of means, centered around the sample mean, that falls:
within the critical cutoff regions, where the null hypothesis can be rejected.
In completing a questionnaire on various global economic issues, 32 percent of randomly selected respondents identified the issues as largely associated with the United States. If the margin of error was ±5.8 percent, what is the interval estimate for the United States?
26.2–37.8 percent
Statistical power can be enhanced by decreasing the standard deviation in the sample. This can be accomplished by all of these EXCEPT:
working with a biased sample
Ideally, a statistical power analysis should be conducted _____ the study.
before
If a researcher runs the same study 20 times, the researcher would expect to find a mean in (or at) the _____ 95 percent of the time, with a p value of 0.05.
confidence interval
In calculating confidence intervals in a z distribution, start by finding the z scores centered around the:
sample mean
A Cohen’s d of –0.19 is what type of effect size?
small