In a study of the effects of diet on blood pressure, one group of 85 people followed a vegetarian diet for 4 months, after which time their mean systolic blood pressure was 15 mm hg lower than at the start. another group of 75 people followed a nonvegetarian diet for the same length of time, after which their mean systolic blood pressure was 1 mm hg lower. if a vegetarian diet had no effect on blood pressure, there would be less than 1 chance in a 100 of getting these results. which statement is valid based on these results? a) the difference in the sample size of the two groups makes a conclusion impossible. b) the recommended diet for lower blood pressure is nonvegetarian. c) the result is not practically significance. d) the result is not statistically significant.