Exam 1 Part 2 Flashcards
Has all the characteristics of interval scale, and ratios of values are meaningful (i.e., there is an absolute zero)
Ratio
The variable of interest is called the ________ (or response, or outcome) variable, and the other is called _______ (or explanatory, or predictor).
Dependent, independent
Summarize a sample of data using graphs and numerical measures such as means or percentages
Descriptive statistics
We use the sample to reflect back on the population the sample represents
Inferential statistics
Data are collected separately for both groups.
Independent samples
Individuals are measured twice (e.g. before and after treatment), or individuals are matched in pairs (e.g. identical twins
Dependent samples
Proportion of times an event will occur in the long run. Gives us the chance, or likelihood of that event occurring.
Probability
What type of distribution is associated with degrees of freedom?
T-distribution
The more df, the closer to _____
Normal
The less df, the thicker the ____
Tails
What are the 2 measurements of center?
Mean, median
What are the 3 measurements of variation?
Range, standard deviation, Interquartile range (Q3 - Q1)
What 3 criteria do we judge normality on (by lookin at a histogram)?
Modality (unimodal, bimodal), symmetry (symmetric, skewed), bell-shape
What are the possible methods of analysis if both variables are categorical?
Compare percentages, contingency table, chi-square
What are the possible methods of analysis if the variables are categorical and numeric?
Compare means, box plots, t-tests