Chapter 4: Q. 4.4 (page 161)
Answer true or false to each statement, and explain your answers.
a. The graph of a linear equation slopes upward unless the slope is 0 .
b. The value of the y-intercept has no effect on the direction that the graph of a linear equation slopes.
a. False
b. True
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
If y tends to decrease linearly as x increases. the variables are -------linearly correlated.
Determine the linear correlation coefficient by formula and definition.
For a data set consisting of two data points:
a. identify the regression line.
b. What is the sum of squared errors for the regression line? Explain your answer.
More Money, More Beer? The data for per capita income and per capita beer consumption for the states and Washington, D.C., from Exercise 4.77 are on the WeissStats site.
a. decide whether the use of the linear correlation coefficient as a descriptive measure for the data is appropriate. If so, then also do parts (b) and (c).
b. obtain the linear correlation coefficient.
c. interpret the value of in terms of the linear relationship between the mo variables in question.
In Problems 3-5, answer true or false to each statement. Explain your answers.
4. A horizontal line has no slope.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
