minimizes the squared residuals
The regression line is the line that
positive when the line slopes upward from left to right
The direction of a relationship between variables can be detected on a scatterplot by considering the angle of the regression line. The relationship is
linear
One key assumption of correlation analysis is that the variables have an essentially ___________ relationships
a line's graph intersects the Y-axis
The Y intercept is the point where
the y intercept and the slope of the line
the position of the least-squares regression line is defined by two elements
every year of education increases income by 1000
If the regression line showing the effect of education on income has a slope of 1000,
pearson's r
If you wanted to measure the association between the age of people (in years) and the number of arrests for driving while intoxicated, the most appropriate measure of association would be
pearson's r
a researcher wants to measure the strength of the association between income (measured in dollars per year) and education (measured in number of years of formal schooling). Which of the following would be the most appropriate measure of association?
fatalities tend to increase as average speed increases
A study of traffic safety shows a correlation (person's r) of 0.57 between average speed traffic and number of fatal accidents for a particular stretch of highway. This means that
0.36
If we calculate an r of 0.60, the proportion of the variation of Y that is explained by X is
1
In most correlation matrices, the diagonal line has a value of
the researcher can predict a direction for the difference
a one-tailed test of significance could be used whenever