Apet food manufacturer runs an experiment to determine whether three brands of dog food ae equally preferred by dogs. in the experiment, 150 dogs are individually presented with three dishes of food, each containing a different brand, and their choices are noted. tabulations show that 62 dogs go to brand a, 43 to brand b, and 45 to brand c. is there sufficient evidence to say that dogs have preferences among the brands? test at the 10% significance level.