Week Eight

Question 1

What is BLUE line

Answer 1

Best Linear Unbiased Estimator

Question 2

What is pearsons correlation

Answer 2

Technique for describing and measuring a linear relationship between two variables

Question 3

What is linear regression

Answer 3

Defines the line and summaries the relationship in the scatter plot

Can be used to predict one variable from: one (simple regression) or more (multiple regression) variables

Provides an estimate of how much y will change if x changes

Used in conjunction with Pearson correlation

If r is not significant, the regression techniques are unnecessary

Question 4

What is the formula for regression.

Answer 4

Y = by + a

Y = predicted value of dependent (outcome) variable

X = value of independence value

B = slip (or gradient) of the regression line ( used to see if you can reject null h )

A = intercept or constant - value of y when x = 0

Question 5

What is SS error

Answer 5

Measure of the standard (average) distance between a regression line and actual data point.

Question 6

How to you find the ss error

Answer 6

Find the sum of squares divisions

Divide by DF to obtain measure of variations dived by 2

Take the square root