Horace keeps track of the amount of time he studies and the score he gets on his quizzes. The data are shown in the table below. Which of the scatter plots below accurately records the data?
Horace keeps track of the amount of time he studies and the score he gets on his quizzes. The data are shown in the table below. Which of the scatter plots below accurately records the data?
Since the scatterplots are not given, we have obtained scatterplot of the given data.
Step 2
The scatter plot can be obtained using EXCEL software.
Enter the values of Hours studying in column A and Quiz score in column B.
Select the range of two variables with labels.
Go to Insert > Charts > Scatterplot.
Click OK.
Step 3
The scatterplot of the data is given below
Unusual points Each of the four scatterplots that follow shows a cluster of points and one “stray” point. For each, answer these questions:
1) In what way is the point unusual? Does it have high leverage, a large residual, or both?
2) Do you think that point is an influential point?
3) If that point were removed, would the correlation be- come stronger or weaker? Explain.
4) If that point were removed, would the slope of the re- gression line increase or decrease? Explain
Match the values of r with the accompanying scatterplots 0.723,-0.353,0.353,0.998 and -0.998
scatterplots 1,2,3,4,5
Which two of the four scatter plots have most positive correlation and closer to zero correlation