time spent studying the subject? To analyze this possibility, a
student took a random sample of 60 students who had enrolled in an
accounting class last semester. She asked each student to report
his or her grade in the course and the total number of hours spent
studying accounting. The data are stored in this Excel
file
Question 1. Use Excel to make a scatterplot of
the data. Select the statement below that best describes what the
scatterplot shows concerning the form of the relationship between
time spent studying and grades.
A. The form of the relationship is nonlinear. As study time
increases, the grades first increase and then begin to
decrease.
B. The scatterplot is just a horizontal "cloud" of points that
shows no discernible form for the relationship between study time
and grades.
C. The form of the relationship is approximately
linear. The slope of the approximating line is positive.
D. The form of the relationship is approximately linear. The
slope of the approximating line is negative.
E. The form of the relationship is nonlinear. As study time
increases, the grades first decrease and then begin to
increase.
Question 2. What is the correlation r between
time spent studying and course grade? (Use 3 decimal places)
Question 3. What is the slope of the least
squares line, where x is the time spent studying and y is the
course grade? (Use 3 decimal places in your answer)
Question 4. How many points would a student's
course grade increase if the student studied an
additional 8 hours? (Use 2 decimal places in your
answer)
Question 5. If a students wants to increase her
grade by 3 points, how many additional hours should she
study? (Use 2 decimal places in your answer)
Question 6. What is the relationship between
the sign of the slope and the sign of the correlation?
The slope b and correlation r are both positiveThe slope b and
correlation r are both negative The slope b
is positive and the correlation r is negative the slope b is
negative and the correlation r is positive
- Are The Grades One Receives In A Course Related To The Amount Of Time Spent Studying The Subject To Analyze This Possib 1 (12.24 KiB) Viewed 116 times
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