Chapter 4: Q. 4.125 (page 189)
If tends to increase linearly as increases, the variables are------ linearly correlated.
Positively
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In Exercise 4.5, 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 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.
Acreage and Value. The document Arizona Residential Property Valuation System, published by the Arizona Department of Revenue, describes how county assessors use computerized systems to value single-family residential properties for property tax purposes. On the Weiss Stats site are data on lot size (in acres) and assessed value (in thousands of dollars) for a sample of homes in a particular area.
a. Obtain a scatterplot for the data.
b. Decide whether finding a regression line for the data is reasonable. If so, then also do parts (c) - f).
Answer true or false to the following statement and provide a reason for your answer: If there is a very strong positive correlation between two variables, a causal relationship exists between the two variables.
For each exercise, determine the linear correlation coefficient using
a. Definition on page
b. Format on page ,
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