T-Tests
The three types of T-Tests
What is Single-Sample, Independent-Samples, and Repeated Measures?
When to use a Z-Test
What is when comparing a sample with a population in which you know the mean and standard deviation?
The shape of the F distribution.
What is positively skewed?
Which of the following correlations shows the highest degree of relationship? A. .91 B. -.97 C. -.03
What is B. -.97?
How to determine when to use Correlated Samples T-Test
What is
Repeated-Measures: one sample, measured twice, compare time 1 to time 2
A t-test provides information about differences in the _____ of two groups.
What are Means?
The value for Z in a Z-test (alpha = .05, two tailed)
What is plus or minus 1.96
How to measure effect size in an ANOVA
What is eta-squared?
What is the difference between random sampling and random assignment?
Random sampling refers to how you select individuals from the population to participate in your study.
Random assignment refers to how you place those participants into groups (such as experimental vs. control).
A researcher reports a positive relationship between ice cream sales and homicide rates. However the researcher suspects that outdoor temperature may also be influencing this relationship. This is an example of the:
What is spurious correlation?
How to compute effect size
What is Cohen's d?
The ____ hypothesis essentially means that there is no difference between two (or more) groups.
What is Null?
Why an ANOVA is different than a Z or T test
What is comparing more than two means?
The following is an example of a _____ correlation: As the number of glasses of water consumed increases, body weight decreases.
What is a negative correlation?
The difference between Type 1 and Type 2 error
What is Type 1 error equals a false positive and Type 2 error equals a false negative?
Criteria to determine large effect size
What is
Small: d is about 0.20
Mod: d is about 0.50
Large: d is about 0.80
Scores on test average 86 with a standard deviation of 9. What is the z-score for someone who earned a 73 on the test?
z=73-86/9
=-1.44
The two sources of variability
What is Between groups variance and within groups variance?
This type of test is used when you are trying to determine if there is a difference between two groups and the data consists of proportions/frequencies.
What is a Chi Square Test?
P refers to the probability that your results _______.
What is "Happened by chance?"