Me, myself and I lecture 4- t-tests and regression

Question 1

what is a t-test?

Answer 1

A t-test determines whether the mean of one group is statistically different from the mean of another group. We only use this test when there are two groups.

Question 2

what is the line of best fit?

Answer 2

The line of best fit is the straight line that best represents the relationship between the dependent variable and the independent variable.

Question 3

what are residuals?

Answer 3

the differences between the observed values and those predicted by the regression line

Question 4

when do the residuals not fit the line?

Answer 4

when they are larger than the line

Question 5

what does each thing stand for in y = mx + c

Answer 5

Y is the predicted value of the dependent variable
X is the value of the independent variable
m is the slope of the line (representing the change in Y for a unit change in X)
c is the y-intercept (the value of Y when X is 0).