A sandwich shop offers four kinds of bread (white, wheat, rye, and multigrain), as well as 5 different kinds of meat (ham, turkey, roast beef, salami, and prosciutto). The revenues were collected for each combination over a period of several days. The sample size was equal to 60. They conducted a two-way ANOVA test to determine if there is a difference in the revenues for the breads and meats. What would be the numerator degree of freedom for the F test statistic to determine if the factor bread was significant