Data Was Collected from CEOs of Companies Within Both the Low-Tech

Multiple Choice

Data was collected from CEOs of companies within both the low-tech industry and the consumer products industry. The following printout compares the mean return-to-pay ratios between CEOs
In the low-tech industry with CEOs in the consumer products industry. HYPOTHESIS: MEAN X = MEAN Y




Using the printout, which of the following assumptions is not necessary for the test to be valid?

A) The population means are equal.
B) The population variances are equal.
C) The samples were randomly and independently selected.
D) Both populations have approximately normal distributions.