If the correlation coefficient, r = -1.0
AP Stats Unit 2 Review

Quiz
•
Mathematics
•
12th Grade
•
Hard
Anthony Clark
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
all the points on the scatterplot must fall exactly on a straight line with a positive slope.
all the points on the scatterplot must fall exactly on a straight line with a negative slope.
all the points on the scatterplot must fall exactly on a straight horizontal line.
all the points on the scatterplot must fall exactly on a straight vertical line.
Answer explanation
r=-1.0 indicates a perfect negative correlation thus all points lie exactly on the straight line with a negative slope.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is least-squares line used for?
To make predictions
To make the graph look pretty
To connect the points
To make it look like you know what you are doing
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Students in a group of chess teams submitted data about hours of team practice and the number of matches the team won. The graph shows the results of the data. Based on the linear regression equation y = 3.52 + 3.14x, if a team practices 4.5 hours per week next year, which is the best prediction of the number of chess matches a team could expect to win?
about 24
about 12
about 8
about 18
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The following scatter plot shows the weights and lengths of some dinosaurs. Which statement accurately describes the information?
The information shows a positive correlation. The weight of a dinosaur tends to increase according to its length.
The information shows a negative correlation. the weight of a dinosaur tends to decrease according to its length.
The information shows no correlation. The weight and length vary according to the type of dinosaur.
The information shows no correlation. The relationship between the weight and length of a dinosaur is uncertain.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Shown is a residual plot. Would a linear regression model of the data be most appropriate?
YES
NO
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Shown is a residual plot. How many negative residuals are there?
5
1
3
9
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What does the slope represent in this situation?
The sloth runs 1 feet in 3 minutes
The sloth runs 3 feet in 1 minute
The sloth runs fast
The sloth runs 6 feet in 1 minute
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