The file FastFood contains the amount that a sample of fifteen customers spent for lunch ($) at a fast-food restaurant: 7.42 6.29 5.83 6.50 8.34 9.51 7.10 6.80 5.90 4.89 6.50 5.52 7.90 8.30 9.60 a. At the 0.05 level of significance, is there evidence that the mean amount spent for lunch is different from $6.50? b. Determine the p-value in (a) and interpret its meaning. (Please explain how to get the p value by hand with the t test).