CSCI A113
Assignment Five

First semester 2000-2001

Due date
Bring this with you at the (second) practical.
Late policy
No late policy. You need to turn this on time.
Work policy
Working in groups is accepted but you need to turn in your own version of the assignment.
Task
Does a student's test grade seem to depend on the number of hours spent studying? The following table shows the number of hours 20 students reported studying for a major test and their test grades. 
          Study   Test                       Study   Test
Student   Hours   Grade            Student   Hours   Grade 

   1        5      54                11       12      74
   2       10      56                12       20      78
   3        4      63                13       16      83
   4        8      64                14       14      86
   5       12      62                15       22      83
   6        9      61                16       18      81
   7       10      63                17       30      88
   8       12      73                18       21      87
   9       15      78                19       28      89
  10       12      72                20       24      93
Answering each of the questions below will bring you a sixth of the points for this assignment.

  1. Arrange the data in the appropriate columns and prepare a scatterplot. Does there appear to be a positive or negative relationship between the two variables?

  2. Compute the correlation coefficient for the data in the exercise above. Comment on the direction and strength of the linear relationship.

  3. Refer to the data above. Insert a linear trendline into your scatterplot.

  4. Use the Regression analysis tool to obtain complete diagnostics.

  5. Make a prediction of test grade for a student who studies ten hours.

  6. Student 7 studied ten hours and received a test grade of 63. Taking into account the number of study hours, is this test grade below average, average, or above average?

Grading
The AI will provide you with feedback in one week. Grades will be posted on-line.

Last updated: December 5, 2000 by Adrian German for A113