THINK4

In regression analysis, the coefficient of determination R2 measures the amount of variation in y that is:

Interpret the unstandardized coefficient for highest years of schooling. E.g., Is the relationship positive or negative? How does a one-unit change in schooling (i.e. an increase in one-year of education) influence Y?  Interpret the constant (i.e. the intercept) in the equation? What does it indicate? Calculate the average number of hours watched for someone with 12 years of education.

In 2000, 12.8% of vehicles sold were off-road vehicles. In 2010, that number decreased to 10.2%. Calculate and interpret the relative change in the number of off-road vehicles sold from 2000 to 2010.

What is the slope of the linear trendline? y= -0.1175x + 256.94

During what year did home prices rise most rapidly and whatis an estimate of this rate?

Find the average rate of change in revenue if the production is changed from 975 car seats to 1,024 car seats.  Round to the nearest cent. $                  per car seat produced Thanks!

Let n be the number of oil refineries at t years since 2004. A reasonable model of the number of oil refineries is n=−3.08t+174.19.   a. What is the​ slope? What does it mean in this​ situation? b. What is the​ n-intercept? What does it mean in this​ situation? c. Predict the number of refineries in 2017.

During what years did home prices decrease? increase?

Choose the coefficient of determination that matches the scatterplot. Assume that the scales on the horizontal and vertical axes are the same. Response Explanatory R2 = 0.73 R2 = -0.53 R2 = 0.98 R2 = 0.12

A superconducting "bullet" train is researched and tested on a track. The steepest section of the track has a rise of 1995 meters for a horizontal distance of 6650 meters. What is the grade of this section of track? 1995meters 6650 meters The grade is %.

= The table shows the percent change in population from 2000 through 2006 for selected states. (a) Which state had the greatest change in population? What was this change? Was it an increase or a decrease? (b) Which state had the least change in population? What was this change? Was it an increase or a decrease? State state A state B state C state D state E state F Percent Change (a) had the greatest change in population in which the population (Type an integer or a decimal.) 3.3 1.5 - 4.2 1.3 - 1.1 0.5 7%.

Describe the following change as both an absolute change in terms of Percentage Points, and as a relative change in terms of a percentage.The percentage of Americans accessing the Internet increased from 66.9% in 2000 to 78.5% in 2010.