There was a difference between the means that is unlikely (less than 1% likely) to have been due to chance alone. We can reject the null hypothesis and claim statistical significance at 0.01 level    The highest (best) efficiency in terms of insect kill rate out of 50 was from method B (38/50), followed  by method A (20/50), while the lowest score was associated with method C (12/50) Method B is approximately twice as efficient as A and more than 3 times as efficient as C.