WorksheetsStats Chapter 4 Test Review
Total questions: 51
Worksheet time: 56mins
What phrase best describes the correlation illustrated?
No correlation
Strong negative
Weak positive
Strong positive
What relationship is suggested by the scatter diagram?
Line of best fit
As age increases, weight increases
As age increases, weight decreases
No relationship between age and weight
What type of correlation does this graph have?
Negative
no correlation
positive
Mrs. Collins made a scatterplot to show the relationship between the number of absences and a student’s final exam score. Based on this scatterplot, a student with 12 absences should get approximately what score on the final exam?
60
92
70
76
Estimate the correlation coefficient for this scatterplot.
r = 1.2
r = 0.89
r = 0
r = -0.89
The correlation coefficient r=0.3 refers to the correlation that is..
Strong positive
Weak positive
Strong negative
Weak negative
The correlation coefficient r=−0.89 refers to the correlation that is...
strong positive
weak positive
strong negative
weak negative
Is this line an accurate line estimate of best fit for the data?
Yes
No
Car weight and distance traveled using a full tank of gas. r=−.86
strong positive
strong negative
weak positive
weak negative
Average time spent listening to music per day and average time spent watching TV per day. r=−.17
strong positive
strong negative
weak positive
weak negative
Describe the correlation.
Positive Moderate
Negative Weak
Positive Weak
No Correlation
According to the scatter plot, how many students took the history test?
(Hint: Count the data points.)
45
13
9
What are the variables being compared in the scatter plot?
Questions Missed
Test
Time Studying
Are there any outliers?
Yes, (45, 8).
Yes, (40, 1).
No.
What kind of relationship does the scatter plot show between time studying and numbers of questions missed?
Positive
Negative
No relationship
There are 40 total paintballs
There are 40 blue paintballs
Blue paintballs were thrown 40 times
The blue paintball hit the target 40 times.
What type of correlation is seen
positive
negative
none
What does r2=0.826 mean?
Strong positive correlation
Weak positive correlation
83% of data is explained
83% of data is unexplained
What does r2=0.281 mean?
28% of the data is explained
28% of the data is unexplained
weak positive correlation
weak negative correlation
What should the average of the residuals be close to?
0
1
-1
100
If I wanted to plug in 17 for x, what would it be?
interpolation
extrapolation
marginal change
residuals
if I wanted to plug in 9 for x, what would it be?
residuals
interpolation
extrapolation
marginal change
Write the LSRL equation. (you can just type y= instead of y hat) Round to the thousandths place. No SPACES
(a)
Based on the table, about what do you think the final grade will be for someone with 14 absences.
70
68
83
48
What is r for the following table?
r=0.947
r=0.897
r=0.898
r=-0.947
The correlation for a data set is r=2.47 inches. Why does this not make sense?
r is between -1 and 1
r should be negative
r should have a label of units not inches
r should be a whole number
The correlation for a data set is r=-4.78. Why does this not make sense?
r can not be negative
r must be greater than 1
r must be between -1 and 1
r must be less than 0
The coefficient of determination is r2=−0.832 , why does this not make sense?
r squared must be greater than 1
r squared must be between -1 and 1
r squared must be between 0 and 1
r squared must be positive
Which of the values is not possible for r?
0.325
-0.578
1.93
0.01
Which of the values is not possible for r2 ?
0.973
0.146
1.682
-0.932
The table shown is comparing a person's foot length to their height in cm. Calculate LSRL using the calculator.
f(x) = 25.05x + 5.57
f(x) = 5.57x + 25.05
f(x) = -5.57x + 25.05
f(x) = 5.57x - 25.05
