statistics
In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 110. The data appear below.
Number of Cups of Coffee
Stress Level
3
5
2
3
4
3
6
9
5
4
1
2
7
10
3
5
= 3.88
X= 5.13
s = 2.03
s = 2.90
Determine the regression equation for predicting stress level from the amount of coffee per day one consumes.
Predict the stress level for someone who drinks 8 cups of coffee a day.

If you need to show the work by hand, you can develop the regression equation in the following format:
predicted y = a + bx
...where a represents the yintercept and b the slope.
To get to that point, here are some formulas to calculate along the way.
To find a:
a = (Ey/n)  b(Ex/n)
Note: E means to add up or to find the total.
To find b:
b = SSxy/SSxx
To find SSxy:
SSxy = Exy  [(Ex)(Ey)]/n
To find SSxx:
SSxx = Ex^2  [(Ex)(Ex)]/n
Note: x = cups of coffee; y = stress level
Once you have the equation, substitute 8 for x, then solve for predicted y.
I hope this will help get you started.posted by MathGuru
Respond to this Question
Similar Questions

Stats
1. In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 110. The data appear below. Number of Cups of Coffee Stress Level 3 5 2 3 4 3 6 9 5 4 
Statistics: Calculate a Pearson's r
In a study on caffeine and stress, college students indicated how many cups of coffee they drink per day and their stress level on a scale of 1 to 10. The data are provided in the following table. Number of Cups of Coffee 3, 2, 4, 
Statistics
In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 1 to 10. The date follow: Number of Cups of Coffee 3,2,4,6,5,1,7,3 Stress Level 
statistics
6. In a study on caffeine and stress, college students indicated how many cups of coffee they drink per day and their current stress level on a scale of 1 to 10. The table shows the survey results. Using a webcalculator, obtain 
Statistics
In a study on caffeine and stress, college students indicated how many cups of coffee they drink per day and their current stress level on a scale of 1 to 10. The table shows the survey results. Using a webcalculator, obtain the 
Statistics
In a study on caffeine and stress, college students indicated how many cups of coffee they drink per day and their current stress level on a scale of 1 to 10. Obtain the appropriate correlation coefficents. 
Research and Statistics
5. The table below shows Psychology exam scores, Statistics Exam scores, and IQ scores for a random sample of students. What can you observe in the relationship between IQ and psychology, psychology and statistics, and IQ and 
statistics
4. Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and standard deviation of 4. Do not use webcalculator to answer the following questions. Instead, 
Statistics: Percentile Rank
A survey of college students was conducted during final exam week to assess the number of cups of coffee consumed each day. The mean number of cups was 5 with a standard deviation of 1.5 cups. The distribution was normal. A. What 
statistics
A survey of college students was conducted during final exam week to assess the number of cups of coffee consumed each day. The mean number of cups was 5 with a standard deviation of 1.5 cups. The distribution was normal. a. What