MATH 240 Sophia stats milestone 4. GRADED A

MATH 240 Sophia stats milestone 4.




MATH 240 Sophia stats milestone 4.




Score 17/18




17 questions were answered correctly
You passed this Milestone
1
The scores of the quizzes of five students in both English and Science are:

English Science
Student 1 6 8
Student 2 5 5
Student 3 9 6
Student 4 4 7
Student 5 8 9


For English, the mean is 6.4 and the standard deviation is 2.0.
For Science, the mean is 7 and the standard deviation is 1.6.

Using the formula below or Excel, find the correlation coefficient, r, for this set of scores. Answer choices are rounded to the nearest
hundredth.




0.50



0.23



0.05



0.42

RATIONALE
In order to get the correlation, we can use the formula:




Correlation can be quickly calculated by using Excel. Enter the values and use the function "=CORREL(".

,MATH 240 Sophia stats milestone 4.




CONCEPT
Correlation
2

This scatterplot shows the number of hours a student slept every night and his or her grade point average.




The equation for the least-squares regression line to this data is: ŷ = 0.375x + 1.33.

What is the predicted GPA for a student who sleeps 2.5 hours per day? Answer choices are rounded to the hundredths place.



2.64



2.46



2.08

, MATH 240 Sophia stats milestone 4.

2.27