A company wanted to test which of its six different sales letters was the most e

Question

A company wanted to test which of its six different sales letters was the most effective in making sales. The company randomly assigned its prospective customers to one of groups, and each group received a different sales letter. Each sales letter either resulted in a sale or no sale. One of the six sales letters produced 50% more sales than the next best performing sales letter. What conclusion can be drawn from this study? Conclusions cannot be made because there was not a control group. There is clear evidence of an association between the sales letters and sales, but it cannot be said there is a causal relationship between the sales letters and sales. There is a causal relationship between the sales letters and sales. Conclusions cannot be made because the lurking variable of the customer's income is confounded with the sales letters.

Explanation / Answer

Since the company wanted to test which of the letters was more affective and not whether the letter was effective or not ,there is no need of control group.

The correct option is

Conclusions cannot be made because thelurking variable of the customer's income is confounded within the sales letters.

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