lecture 6 correlation and regression

Question 1

scatterplots are used to investigate relationship between _____ variables.

Answer 1

continuous

Question 2

correlation is a method to quantify ____ and ______

Answer 2

direction; magnititude

Question 3

when to use pearson’s correlation coefficient?

Answer 3

when both variables are normally distributed.

Question 4

explain what is intercept, slope and residual

Answer 4

intercept: the value y takes when x is zero; slope: the change in y when x is changed by every 1 unit; residual: distance between points and the line

Question 5

what is the best linear regression line?

Answer 5

the line closet to all data points

Question 6

what is r and r squared

Answer 6

r: the degree of correlation; r squared: how much of total varation in dependent variable can be explained by the independent variab;e

Question 7

The Pearson coefficient is the appropriate measure to estimate the linear correlation between any two continuous variables.

Select one:
True
False

Answer 7

false