Unit Quiz 3

Question 1

How to describe scatter plots

Answer 1

DOFS
direction
Outlier
Form
Strength

Question 2

What is direction

Answer 2

Positive negative neither

Question 3

What is outlier

Answer 3

Deviation from the overall pattern

Question 4

What is form

Answer 4

Linear
Non linear(curved)
Scatter

Question 5

What is strength

Answer 5

Has to do with correlation
Weak moderate strong

Question 6

Which variable is explanatory

Answer 6

X

Question 7

Which variable is response

Answer 7

Y, dependent variable

Question 8

What is r^2

Answer 8

Coefficient of determination
About (r^2) % of variation of y-variable is accounted for by the linear model relating y-variable to x-variable

Question 9

Residuals

Answer 9

y-y hat
Actual - predicted

Question 10

Least squares regression line

Answer 10

y(hat) = a + bx

Question 11

OTHER formulas to do with solving for a and b

Answer 11

A = y(mean) - b[x(mean)]

B = r(Sy/Sx)
(SDVy over SDV x)

Question 12

What does least squares mean

Answer 12

The line that makes the sun of the squares residuals as small as possible

Question 13

When is the LSRL not appropriate

Answer 13

When the residual plot shows a leftover pattern

Question 14

Mini tab
What does S stand for

Answer 14

Standard deviation of the residuals