An automobile dealer wants to see if there is a relationship between monthly sales and the interest rate. a random sample of 4 months was taken. the results of the sample are presented below. monthly sales (y) interest rate (in percent) (x) 22 9.2 20 7.6 10 10.4 45 5.3 a) use the method of least squares to compute an estimated regression line. b) obtain a measure of how well the estimated regression line fits the data.

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function. a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.