# Question: Three brands of tires were tested on each of four

Three brands of tires were tested on each of four makes of car. Three cars of each make were used. The number of miles traveled, in thousands, is given as follows for each car.

a. Can you reject the hypothesis of no interactions? Explain.

b. Can the main effect of car type on number of miles traveled be interpreted?

If so. interprvt the main effect. using the a = 0.05 level of significance. If not, explain why not.

c. Can the main effect of tire on number of miles traveled be interpreted? If so. interpret the main effect, using the a = 0.05 level of significance. If not. explain why not.

a. Can you reject the hypothesis of no interactions? Explain.

b. Can the main effect of car type on number of miles traveled be interpreted?

If so. interprvt the main effect. using the a = 0.05 level of significance. If not, explain why not.

c. Can the main effect of tire on number of miles traveled be interpreted? If so. interpret the main effect, using the a = 0.05 level of significance. If not. explain why not.

## Answer to relevant Questions

Construct and interpret an interaction plot for the data in Exercise 12. Earth scientists measured several chemical properties in water samples taken from wells at three locations. Following are sample means, standard deviations, and sample sizes for pH measurements. a. What are the sample sizes ...Why are the main effects misleading when interactions are present? Following are the prices, in dollars, of a sample of 20 air conditioners. Can you conclude that the median price differs from $300? Use a = 0.01 level of significance. Can you conclude at the a = 0.05 level that the median number of species is greater for a retentions time of days than for a retention time of 3 days? Compute the appropriate test statistic, find the P- value and state a ...Post your question