WorksheetsRegression Lines and Correlation
Total questions: 15
Worksheet time: 1hrs 22mins
Is this a positive, negative, or no relationship?
positive relationship
negative relationship
no relationship
Is this a positive, negative, or no relationship?
positive relationship
negative relationship
no relationship
Is this a positive, negative, or no relatioship?
Positive relationship
Negative relationship
No relationship
Is r = -0.87 strong, moderate, or weak?
strong
moderate
weak
A positive relationship (correlation coefficient) means...
variables have the same behavior (both up or both down)
variables have opposite behavior (one up, one down)
the variables are happy :)
the variables are sad :(
What is the linear regression formula?
y=mx+b
y=ax+b
y=a+bx
Use your calculator to compute the least-squares regression line for the following data:
x: 3.9, 5.8, 4.8, 3.3, 1.8, 3.4, 3.2
y: 4.6, 4.1, 5.2, 4.5, 9.2, 5.6, 4.3
y = -0.97x+8.99
y = 0.97x-8.99
y = -62x+6443
= 62x-6443
If x is temperature and y is coffee sales, use the following formula to determine the coffee sales on a 34° day.
y = -60x+6443
$4584
$4673
$8303
How do you find the residual?
predicted value - actual value
actual value - predicted value
what values are you talking about?
y= 40x+100, where x is number of weeks and y is weight in grams.
What does the y-intercept mean in context of the problem?
The annual profits for a company are given in the following table, where x represents the number of years since 1992, and y represents the profit in thousands of dollars. Write the linear regression equation that represents this set of data, rounding all coefficients to the nearest hundredth. Using this equation, estimate the year in which the profits would reach 378 thousand dollars.
2029
2014
2003
8753
