Four different types of insecticides are used on strawberry plants. The number of strawberries on each randomly selected plant is recorded. The followings are the requirements that must be satisfied in order to use the one-way ANOVA procedure. What is the incorrect one?

a.The means of population are zero.

b.The population have the same variance.

c.Each group represents a simple random sample from its respective population.

d.All samples are independent of one another.

e.The population are normally distributed.