Stats 101 Exam Short Answers Flashcards
What are the 3 Assumptions for Two Independent Sample T-Procedures?
Observations from within same group and between groups are independent, underlying distributions are normal.
What are the 2 Forms of the Two Independent Sample T-Test?
Pooled and non-pooled forms.
What is the Pooled Form of the Two Independent Sample T-Test?
Carries the assumption of equal standard deviations.
What is the Non-Pooled Form of the Two Independent Sample T-Test?
Doesn’t carry the assumption of equal standard deviations.
What are the 2 Assumptions for One Sample T-Procedures?
Observations are independent of each other, underlying distribution is normal.
What Happens for One Sample T-Tests if the Sample Size is Large?
We don’t need the normality assumption.
How do we Calculate the F-Test Statistic?
Divide variability between group means by the variability within the groups.
What are the 4 Assumptions for One-Way ANOVA F-Tests?
Observations from within groups are independent, groups are independent, underlying distributions are normal, standard deviations are equal.
How do we Check Standard Deviations are Equal?
Largest se / smallest se should be < 2.
How do we Calculate the Chi-Square Test Statistic?
(Observed count - expected count)^2 / expected count for each cell added together.
What are the Two Requirements for the Chi-Square Test Statistic?
At least 80% of the expected counts must be 5 or more, each expected count must be greater than 1.
What is B0?
The y-intercept.
What is B1?
The slope of the line (infront of the x).
What does r Measure?
The strength and direction of the linear association between two numeric variables, how close the points come to lying on a straight line.
Does r Have Units?
No.
