# Question: Refer to Exercise 13 54 The agronomist is concerned that there

Refer to Exercise 13.54. The agronomist is concerned that there may be a distinct difference between the models for land in West Texas and for land in East Texas. Observations 1– 23 are data values from East Texas and 24- 46 are from West Texas.

a. At the α = .05 level, are there differences between the models for the two regions?

b. For each of the two regions, produce a 95% confidence interval on the average evaporation for the values of the explanatory variables given in Exercise 13.54.

c. Was the there a large difference in the point estimators for the two regions? Compare the widths of the intervals for the two regions.

In exercise

QUESTION CONTINUE TO NEXT PAGE……

a. At the α = .05 level, are there differences between the models for the two regions?

b. For each of the two regions, produce a 95% confidence interval on the average evaporation for the values of the explanatory variables given in Exercise 13.54.

c. Was the there a large difference in the point estimators for the two regions? Compare the widths of the intervals for the two regions.

In exercise

QUESTION CONTINUE TO NEXT PAGE……

**View Solution:**## Answer to relevant Questions

A random sample of 22 residential properties was used in a regression of price on nine different independent variables. The variables used in this study were as follows: PRICE = selling price (dollars) BATHS 5 number of ...Refer to Exercise 13.58. In another study involving the same 22 properties, PRICE was regressed on a single independent variable, LIST, which was the listing price of the property in thousands of dollars. a. Fit a regression ...Thirty volunteers participated in the following experiment. The subjects took their own pulse rates (which is easiest to do by holding the thumb and forefinger of one hand on the pair of arteries on the side of the neck). ...The following data on air pollution in 41 U. S. cities are from Biometry (Sokal and Rohlf, 1981). The type of air pollution under study is the annual mean concentration of sulfur dioxide. The values of six explanatory ...Refer to Exercise 13.8. a. Fit the model y = β0 + β1x1 + β2x2 + β3x12 + β4x22 + β5x1x2 + ɛ to the aphid data. b. Compare the fit of the linear model from Exercise 13.8 to the fully quadratic model fit in part (a) of ...Post your question