Question: A new potato chip is to be test-marketed by giving a free sample to randomly selected customers and asking them to state whether or not they like the product. With a 95% confidence level and a target sampling error of 0.05 or less, what sample size would you recommend in each of the following cases?

a) Preliminary estimates are that approximately 22% of the individuals in the population will like the product.

b) No information is available about the proportion in the population that will like the product.