Question 1 - The sales director was inclined to conduct an experiment because a treatment was applied to the sales representative.
A causality statistical study would be best.
Question 2 - In the Midwest region, the difference between those with training and without led to a 0.38 difference.
In the Northeast, the difference between those with training and without led to a 0.74 difference.
This means that a one-month training program increases sales.
The data shows that because a treatment was applied to sales representatives in that some of them were trained, the best way to find out the effect of this treatment would be an experiment.
This experiment would show if there is a causality relationship between training and sales numbers.
Midwest:
= (234 - 196) / 100
= 0.38
Northeast:
= (252 - 178) / 100
= 0.74
Those with training in the Midwest sold 0.38 more than those without training. And those with training in the Northeast sold 0.74 more.
This means that the training does indeed increase sales.
Find out more on the effects of training at https://brainly.com/question/12427808.