Practice Quiz Q's Flashcards
What are the two types of variance that can occur in your data?
Between and within groups
A researcher interested in stress levels of fish. Took the same group of 8 fish and measured stress hormone in controlled conditions and again, later, put the same fish a tank with stressors. The data were normally distributed. What test to use to compare experimental conditions?
Paired sample t-test
An independent t-test can be used to assess what
Differences in means between two unrelated groups
What kind of variable is a ‘species’
A categorical variable
Assumptions that must be met to use a standard on-way ANOVA
Data must be normally distributed.
There is homogeneity of variance.
Samples need to be independent
The dependent variable must be interval or ratio
There is only one dependent variable
What is homogeneity of variance
Homogeneity of variance is an assumption underlying both t tests and F tests (analyses of variance, ANOVAs) in which the population variances (i.e., the distribution, or “spread,” of scores around the mean) of two or more samples are considered equal.
Outliers are
Values very different from the rest of the data
Have an effect on the mean
Have an effect on regression parameters.
What is the relationship between sums of squares (SS) and variance
s2=SS/n-1
Conducting multiple t-tests increase the likelihood of what
Type I error
R squared is known as
Coefficient of determination
What assumption of sphericity is not true
The assumption that variances for levels of a repeated measures variable are equal
What are the two types of variance that can occur in your data
Between and within groups
Examples of post-hoc tests
Bonferroni
LSD
Tukey
Sidak
Statement of outliers that’s not true
Influential cases will always show up as outliers
You need to graphically show the distribution of quartiles in a dataset. The best graph to use it:
Boxplot
