Stats homework please help

Question

(a) A survey is conducted to determine if the age of a vehicle can be used to predict the fuel efficiency in mpg. Identify the explanatory variable and the response variable.

(b) Find the point estimate (sample mean) given the confidence interval (12.0,14.8)

Answer 1

a) The explanatory variable is the age of the vehicle. The response variable is fuel efficiency. In other words, fuel efficiency is dependent on many parameters, including age of a vehicle.

b) Sample Mean: (12.0 + 14.8)/2 = 26.8/2 = 13.4

The sample mean is the center of the confidence interval. Assume that this is a confidence interval for the true population mean.