Inferential Statistics Part 2 Flashcards
What are the X2 requirements for chi-square tests?
Observations must be independent
No small expected frequencies
What is a measure of mathematical relationships that may exist between 2 or more variables?
Correlation
What is commonly used with correlation?
Pearson’s correlation coefficient (r)
Correlation coefficient values range from?
-1 to +1
A strong relationship between two variables does not mean what?
One caused the other to change
What is an X-Y graph with symbols that represent the values of two variables?
Scatterplots
Scatterplots show what between variables?
Form
Direction
Strength of the relationship
What are extreme values that are located far away from the group of data on a scatterplot?
Outliers
Outliers can stringy influence what?
Slope of Regression Line
Coefficient of determination is the correlation coefficient squared which is symbolized as?
r2
For the coefficient of determination only positive values are?
Posssible (0-1)
Coefficient of determination denotes how much of the variation in one variable can be explained by what?
The other variable
What is calculations of the line of best fit passing through a set of data?
Regression Analysis
Using the equation of regression analysis, predictions can be made about what?
Direction and Amount Variables Change
What is fitted by minimizing the sum of squared deviations of the data points from the least squares line?
Regression Line
