# Question

Consider the following set of data points.

a. Compute the linear correlation coefficient, r.

b. Can you conclude from your answer in part (a) that the variables x and y are unrelated? Explain your answer.

c. Draw a scatterplot for the data.

d. Is use of the linear correlation coefficient as a descriptive measure for the data appropriate? Explain your answer.

e. Show that the data are related by the quadratic equation y = x2. Graph that equation and the data points.

a. Compute the linear correlation coefficient, r.

b. Can you conclude from your answer in part (a) that the variables x and y are unrelated? Explain your answer.

c. Draw a scatterplot for the data.

d. Is use of the linear correlation coefficient as a descriptive measure for the data appropriate? Explain your answer.

e. Show that the data are related by the quadratic equation y = x2. Graph that equation and the data points.

## Answer to relevant Questions

y = 3 + 4x a. Find the y-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. The data from Exercise 4.68 for home size (in square feet) and assessed value (in thousands of dollars) for the same homes as in Exercise 4.135 are on the WeissStats CD. a. Decide whether use of the linear correlation ...The coefficient of determination of a set of data points is 0.716. a. Can you determine the linear correlation coefficient? If yes, obtain it. If no, why not? b. Can you determine whether the slope of the regression line is ...y = 2 a. Find the y-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. −1.5 and 0 a. Determine whether it slopes upward, slopes downward, or is horizontal, without graphing the equation. b. Find its equation. c. Use two points to graph the equation.Post your question

0