A researcher is told that the average age of respondents in a survey is 49 years. She is interested in finding out if most respondents are close to 49 years or not. The measure most appropriate to answer this question is:

Rick Johnson trains his company's sales force to target the consumer

He repeatedly asks his team to bear in mind the fact that it is the sales team's responsibility to rouse the consumer's interest and make the consumer feel that he or she needs the product. A true salesman is one who can convert an indifferent consumer walking into the store into a new customer. Johnson believes in the ________ concept. A) product B) production C) selling D) marketing E) social responsibility

The equation for a 95% confidence interval is: ________

A) ± 1.65 ? 

B) ± 1.65 ? 

C) ± 1.96 ? 

D) A, B, C are incorrect