# Question: J Greene and J Touchstone conducted a study on the

J. Greene and J. Touchstone conducted a study on the relationship between the estriol levels of pregnant women and the birth weights of their children. Their findings, "Urinary Tract Estriol: An Index of Placental Function," were published in the American Journal of Obstetrics and Gynecology (Vol. 85(1), pp. 1-9). The data from the study are provided on the WeissStats CD, where estriol levels are in mg/24 hr and birth weights are in hectograms.

a. Decide whether finding a regression line for the data is reasonable. If so, then also do parts (b)–(d).

b. Obtain the coefficient of determination.

c. Determine the percentage of variation in the observed values of the response variable explained by the regression, and interpret your answer.

d. State how useful the regression equation appears to be for making predictions.

a. Decide whether finding a regression line for the data is reasonable. If so, then also do parts (b)–(d).

b. Obtain the coefficient of determination.

c. Determine the percentage of variation in the observed values of the response variable explained by the regression, and interpret your answer.

d. State how useful the regression equation appears to be for making predictions.

## Answer to relevant Questions

What can you say about SSE, SSR, and the utility of the regression equation for making predictions if a. r2 = 1? b. r2 = 0? a. Definition 4.7 on page 171. b. Formula 4.3 on page 171. Compare your answers in parts (a) and (b). Following are the data on percentage of investments in energy securities and tax efficiency from Exercises 4.50 and 4.88. a. Obtain the linear correlation coefficient. b. Interpret the value of r in terms of the linear ...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 4.104 for age and percentage of body fat for 18 randomly selected adults are on the WeissStats CD. a. Decide whether use of the linear correlation coefficient as a descriptive measure for the data is ...Post your question