# Question: The Internet Use data file on the text CD contains

The Internet Use data file on the text CD contains data on the number of individuals with broadband access and Gross Domestic Product (GDP) for 33 nations. Let x represent GDP (in billions of U.S. dollars) and y = number of broadband users (in thousands).

a. The MINITAB output shows a scatterplot. Describe this plot in terms of the variability of broadband subscribers for nations with low GDP.

b. Give the approximate x - and y -coordinates for the nation that has the highest number of broadband subscribers.

c. Use software to calculate the correlation coefficient between the two variables. What is the sign of the coefficient? Explain what the sign means in the context of the problem.

d. Identify one nation that appears to have fewer broadband subscribers than you might expect based on that nation’s GDP, and one that appears to have more.

e. If you recalculated the correlation coefficient after removing the two observations you identified in part d, how would you expect the resulting coefficient to compare to the one obtained in part c?

a. The MINITAB output shows a scatterplot. Describe this plot in terms of the variability of broadband subscribers for nations with low GDP.

b. Give the approximate x - and y -coordinates for the nation that has the highest number of broadband subscribers.

c. Use software to calculate the correlation coefficient between the two variables. What is the sign of the coefficient? Explain what the sign means in the context of the problem.

d. Identify one nation that appears to have fewer broadband subscribers than you might expect based on that nation’s GDP, and one that appears to have more.

e. If you recalculated the correlation coefficient after removing the two observations you identified in part d, how would you expect the resulting coefficient to compare to the one obtained in part c?

## Answer to relevant Questions

The previous problem discusses GDP, which is a commonly used measure of the overall economic activity of a nation. For this group of nations, the GDP data have a mean of 1771 and a standard deviation of 2781 (in billions of ...Use the points from the previous exercise with x = 3, 5, 6, 7. a. Find the z -scores on x and on y for each point. Comment on how zx and zy relate to each other for each point. b. Compute r using the z -scores from part a ...Identify the values of the y -intercept a and the slope b, and sketch the following regression lines, for values of x between 0 and 10. a. ŷ = 7 + 0.5x b. ŷ = 7 + x c. ŷ = 7 - x d. ŷ = 7 A study in 2000 by the National Highway Traffic Safety Administration estimated that failure to wear seat belts led to 9200 deaths in the previous year, and that the number of deaths would decrease by 270 for every 1 ...Is there a relationship between the weight and price of a mountain bike? This question was considered in Exercise 3.21. We will analyze the Mountain Bike data file on the text CD. (The data also were shown in Exercise ...Post your question