Explain whether an experiment or an observational study would be

Explain whether an experiment or an observational study would be more appropriate to investigate the following:
a. Whether or not smoking has an effect on coronary heart disease
b. Whether or not higher SAT scores tend to be positively associated with higher college GPAs
c. Whether or not a special coupon attached to the outside of a catalog makes recipients more likely to order products from a mail-order company
Coupon
A coupon or coupon payment is the annual interest rate paid on a bond, expressed as a percentage of the face value and paid from issue date until maturity. Coupons are usually referred to in terms of the coupon rate (the sum of coupons paid in a...

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