PSYC 210 Exam 3 Review Kurnellas

A researcher conducts a two-tailed test with an alpha of .05 and obtains a z-statistic of 1.7. What should she do?

Imagine the CI around a test mean of 70% is [60%, 80%]. What is the margin of error?

I conduct a study on anxiety differences & get a z statistic of 2.98. Using .05 alpha, what is the decision?

Nonparametric statistics...

If a researcher has a directional hypothesis, they should conduct a ____________ test

The hypothesis "M₁ > M₂" most likely requires a

What proportion/area of a normal distribution falls above a z score of 1.5?

What are the critical value(s) for a two-tailed z-test?

If the p-value for our test statistic is smaller than our chosen alpha level (e.g., alpha = .05), what do we do?

"statistical significance" means our findings were unlikely to have occured by random chance alone

Increasing the alpha level...

The range of scores contained in an 85% CI will be ____ the range contained in an 95% CI.

What is the denominator of the z-statistic formula? (AKA what do we divide by?)

All else being equal: lower variability will lead to a ______ effect size

What is the critical value for a one-tailed (direction) z-test?

All else being equal: a larger mean difference, means a _____ effect size (don't overthink this one)

Why are effect sizes rather than test statistics (like a z statistic from a z test) used when comparing study results?

Effect size is influenced by sample size (n)

z scores are used to compare a sample to the population

Imagine the CI around a test mean is [60%, 80%]. What is the point estimate for the mean test score?

SocSciStatistics.com has a calculator for ________

According to Cohen's guidelines, an effect size of d = .03 is

What proportion/area/% of a normal distribution falls below a z score of 1.5?

Increasing sample size (n), increases _________

The probability that we correctly reject the null, if the null is false is called _________________