Which test?
A researcher compares one sample mean to a known population mean, but the population standard deviation is unknown.
What is a one-sample t-test?
A 2 × 2 design has this many independent variables.
What is two independent variables?
When one IV affects the DV regardless of the level of another IV.
What is a main effect?
Rejecting a true null hypothesis is this type of error.
What is a Type I error?
This statistic tells us whether group means differ more than expected by chance in ANOVA.
What is the F statistic?
Two independent groups (therapy vs. no therapy) are compared on depression scores.
What is an independent-samples t-test?
A 2 × 3 design has this many conditions.
What is six conditions?
When the effect of caffeine depends on whether students slept 4 or 8 hours.
What is an interaction?
Failing to reject a false null hypothesis is this type of error.
What is Type II error?
This value tells us whether a result is statistically significant.
What is the p-value?
The same participants’ stress levels are measured before and after finals week.
What is a dependent-samples t-test?
A study measuring mood before, during, and after exercise uses this type of design.
What is a within-subjects design?
Parallel lines on an interaction plot usually indicate this.
What is no significant interaction?
The probability of rejecting a false null hypothesis is called this.
What is statistical power?
This statistic estimates the proportion of variance explained by an effect in ANOVA.
What is η² (eta squared) or partial η²?
Three caffeine levels (none, low, high) are compared across different participants.
What is a one-way randomized ANOVA?
A study comparing dogs, cats, and birds on attachment scores has this many levels of the IV.
What is three levels?
Crossing lines on an interaction plot usually indicate this.
What is a significant interaction?
If p = .03 and α = .05, we make this decision.
What is reject the null hypothesis?
After a significant repeated-measures ANOVA with three levels, this test tells us which groups differ.
What are post-hoc comparisons?
The same participants are measured after zero, one, and three coffees.
What is a repeated-measures ANOVA?
A two-way factorial ANOVA always tests these three effects.
What are main effect of IV1, main effect of IV2, and interaction?
A 2 x 3 x 2 design can have how many main effects?
What is three?
Increasing sample size generally has this effect on power.
What is it increases power?
If Mauchly’s test is significant in repeated-measures ANOVA, we apply this correction.
What is do not assume sphericity, (e.g. use the Greenhouse–Geisser correction)?