Inferential Statistics Part 2 Flashcards Preview

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Flashcards in Inferential Statistics Part 2 Deck (16)
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1

What are the X2 requirements for chi-square tests?

Observations must be independent
No small expected frequencies

2

What is a measure of mathematical relationships that may exist between 2 or more variables?

Correlation

3

What is commonly used with correlation?

Pearson's correlation coefficient (r)

4

Correlation coefficient values range from?

-1 to +1

5

A strong relationship between two variables does not mean what?

One caused the other to change

6

What is an X-Y graph with symbols that represent the values of two variables?

Scatterplots

7

Scatterplots show what between variables?

Form
Direction
Strength of the relationship

8

What are extreme values that are located far away from the group of data on a scatterplot?

Outliers

9

Outliers can stringy influence what?

Slope of Regression Line

10

Coefficient of determination is the correlation coefficient squared which is symbolized as?

r2

11

For the coefficient of determination only positive values are?

Posssible (0-1)

12

Coefficient of determination denotes how much of the variation in one variable can be explained by what?

The other variable

13

What is calculations of the line of best fit passing through a set of data?

Regression Analysis

14

Using the equation of regression analysis, predictions can be made about what?

Direction and Amount Variables Change

15

What is fitted by minimizing the sum of squared deviations of the data points from the least squares line?

Regression Line

16

What is the regression equation?

Y=a+bX
a-Y intercept
b-slope of line
X-value of variable