There is a belief among many people that a healthy diet will cost more than a less healthy diet. Using research based on the available population survey data, can you conclude that a healthy diet will in fact cost more than a less healthy diet? Using the daily cost and the measure of HEI, provide evidence to either accept or reject this general belief. You will do the analysis based first on the data from the first interview, creating subsets of the data file using daycode

= 1, and a second time using data from the second interview, creating subsets of the data file using daycode = 2. Note differences in the results between the first and second interviews.