Refer to the scatter plots showing Time on Homework vs. Exam scores in a statistics class to answer the questions below.
Which variable is the predictor and which is a response in the
above model?
1.
2.
3.
4.
5.
Interpret the circled data points on Exam 1 scatterplot.
Describe the relationship for Exam3.
(weak, moderate, strong, positive, negative)
How do you interpret the differences between the three
scatterplots?
Use the scatterplots to estimate the average time on homework for
each of the exams and the average exam scores.
Use the scatterplots to estimate the correlation coefficient for each
of the exams. Mentally exclude outliers in Exam 1.
6. Refer to the scatterplots and summaries below.
Exam (% correct)
Exam (% correct)
Exam 1
Exam (% correct)
b. Fill in the blank:
Spending 10 minutes on homework will improve your Exam 1 score by
100
80
60
40
20
0
Exam 2
100
80
20
0
8889°
Exam 3
100
0
20
0
0
0
a. Which numerical measures are most affected by the removal of outliers.
50
50
50
2
100
150
Homework (minutes)
100 150
Homework (minutes)
100
150
Homework (minutes)
%. Explain your choice