b. Prior to buying a vehicle, people will visit the Auto Online site approximately 3 times. Hints: . Study Ch. 16 first. . la and 1b are to estimate population average, and SPSS can do it for you. (Refer p. 478-479) . 1c and 1d are to estimate population percentage, and you have to do it by hand. Using SPSS to get the sample percentage, and then follow the example of p. 477 to calculate the range of population percentage. . For Q2, there is an example on p. 488-490, which showed the specific steps of conducting hypothesis testing