Justin Rice
AP Stat. Quiz
Quiz Chapter 3
1. Which correlation is stronger?
A. 0.97103
B. 0.99134
C. 0.97104
D. 0.94312
2. A response variable…
A. Attempts to explain observed outcomes.
B. Measures outcome to a study
C. has a value less than one
D. All of the above
3. An explanatory variable
A. Measures outcome to a study
B. Value is less than one
C. Attempts to explain observed outcomes.
D. None of the above
4. Scatterplots
A. show relationship between two quantitative variables measured on same individuals.
B. show relationship between two infinite variables measured on different individuals.
C. show relationship between two quantitative variables measured on different individuals.
D. use dots to measure points in a line.
5.
A.
B.
C.
D.
You can describe overall pattern of a scatterplot by the …
Form
Direction
Strength
All the above
6. Suppose we have an explanatory and response variables and we know that the mean of
x is 17.222, mean of y is 161.111, Sx is 19.696, Sy is 33.479, and r=.997. The slope
can be calculated as…
A. 1.695
B. 2.134
C. 1.743
D. 2.339
7. Suppose we have an explanatory and response variables and we know that the mean of
x is 17.222, mean of y is 161.111, Sx is 19.696, Sy is 33.479, and r=.997. The intercept
can be calculated as…
A. 132.76
B. 131.923
C. 131.92
D. 130.9992
8. X = {0, 5, 10}, Y = {0, 7, 8} Find the r^2 of the points above
A. 0.961
B. 0.482
C. 0.842
D. 0.239
9.
A.
B.
C.
D.
LSRL Stands for
Least sum rated state
Least Squares Regression Line
Least Sum Regression Squares
Lots of Squares Of the Regression Line
10. A regression line is
A. a straight line that describes how a response variable y changes as an explanatory
variable x changes.
B. a straight line ŷ = a+bx that minimizes the sum of the squares of the vertical distances
of the observed points from the line.
C. a line that fits the graph the best.
D. All of the above