# Question

The data from Exercise 4.69 for average high and low temperatures in January for a random sample of 50 cities are on the WeissStats CD.

a. Decide whether use of the linear correlation coefficient as a descriptive measure for the data is appropriate. If so, then also do parts (b) and (c).

b. Obtain the linear correlation coefficient.

c. Interpret the value of r in terms of the linear relationship between the two variables in question.

a. Decide whether use of the linear correlation coefficient as a descriptive measure for the data is appropriate. If so, then also do parts (b) and (c).

b. Obtain the linear correlation coefficient.

c. Interpret the value of r in terms of the linear relationship between the two variables in question.

## Answer to relevant Questions

The data on shell thickness and concentration of PCBs for 60 Anacapa pelican eggs from Exercise 4.70 are on the WeissStats CD. a. Decide whether use of the linear correlation coefficient as a descriptive measure for the data ...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 = −0.75x − 5 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. 0.4 and 1 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. Regarding the criterion used to decide on the line that best fits a set of data points, a. What is that criterion called? b. Specifically, what is the criterion?Post your question

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