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Chapter 4: Q. 17 (page 192)
A value of close to -suggests a strong------ linear relationship between the variables.
A value of close to indicates that the variables have a strong negative linear connection.
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In Exercise 4.6, we give linear equations. For each equation,
a. find the -intercept and slope.
b. determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation.
c. use two points to graph the equation.
Given equation is,
For each exercise, determine the linear correlation coefficient by using
a. Definition 1.8 on page 183.
b. Formada 4.4 a pace 185.
Compare your answers in parts a) and (b).
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.
13. Identify a use of the coefficient of determination as a descriptive measure.
For which of the following sets of data points can you reasonably determine a regression line? Explain your answer.
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