00:01
Hello, so a question today is if a student scored 24 points about the mean of total quiz mark, then how many points above the mean would her final exam grade be? now, we're given that the number of quizzes by the professor is 10.
00:16
The number of students is 205.
00:18
Standard deviation of the quiz is 11.
00:21
Standard deviation of the exam is 18.
00:24
And r, which is our correlation, is 0 .73.
00:30
Now, in order to do this problem, we need to find an equation that will help us to predict the exam score given the quiz score.
00:40
So it would be in the form of y equals the mx plus c, where m is the slope.
00:47
Now, in order to find the slope, it will be equal to r, which is our correlation, times standard deviation of the exam, divided by the standard deviation of the quiz.
00:58
So let us go ahead and find the slope, which would be 0 .73 times standard deviation of the exam, which is 18, divided by 11, which gives us approximately 1 .1945, that is to four decimal places...