A regression analysis of total labor costs (y) based upon the number of visitors (x) for the Wacky World Theme Park, yielded a coefficient of $2.75 on the number of visitors. The p-value associated with that coefficient was 0.02 and the R2=921. Based upon those results, we can conclude a. The coefficient on the number of visitors variable is statistically significant b. Visitors cause all labor costs c. The coefficient on the number of visitors variable is not statistically significant d. All of the above