uses ... to empirically investigate the questions at issue. In addition, formal tests were carried out to verify the validity and reliability of the test results. However, a few limitations are unavoidable when carrying out the work. The first limitation comes from the data considered. Auto makers and dealers sell various versions for one specific auto model. For example, there are multiple versions in the Cobalt family as the type of the compact sedan. In this study, it is assumed that the product is