Questions from Essentials of Statistics

Q: The data for volume, in cubic feet, and diameter at

The data for volume, in cubic feet, and diameter at breast height, in inches, for 70 shortleaf pines are on the WeissStats site. Use the technology of your choice to a. decide whether use of the linea...

Q: The data for age and percentage of body fat for 18 randomly

The data for age and percentage of body fat for 18 randomly selected adults are on the WeissStats site. Use the technology of your choice to a. decide whether use of the linear correlation coefficient...

Q: Surveys that combine one or more of simple random sampling, systematic

Surveys that combine one or more of simple random sampling, systematic random sampling, cluster sampling, and stratified sampling employ what is called sampling.

Q: The data for estriol levels of pregnant women and birth weights on

The data for estriol levels of pregnant women and birth weights on the WeissStats site. Use the technology of your choice to a. decide whether use of the linear correlation coefficient as a descriptiv...

Q: In the article “Comparison of Fiber Counting by TV Screen and

In the article “Comparison of Fiber Counting by TV Screen and Eyepieces of Phase Contrast Microscopy” (American Industrial Hygiene Association Journal, Vol. 63, pp. 756–761), I. Moa et al. reported on...

Q: A quantitative data set has size 50. At least how many

A quantitative data set has size 50. At least how many observations lie within three standard deviations to either side of the mean?

Q: The coefficient of determination of a set of data points is 0

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...

Q: A Knight-Ridder News Service article in an issue of the

A Knight-Ridder News Service article in an issue of the Wichita Eagle discussed a study on the relationship between country music and suicide. The results of the study, coauthored by S. Stack and J. G...

Q: Exercise 4.14 a. construct a scatterplot for the

Exercise 4.14 a. construct a scatterplot for the data. b. decide whether using the rank correlation coefficient is reasonable. c. decide whether using the linear correlation coefficient is reasonable....

Q: −2 and −3 a. determine whether it slopes

−2 and −3 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.