Which of the following statements about matched-pairs sampling is correct?

A) It is a procedure that matches each unit from population A with a "twin" from population B so that any sample observation about a unit in population A automatically yields an associated observation about a unit in population B.
B) It is designed to control for extraneous factors that might influence the characteristic being measured in addition to the variable under study.
C) When testing the effectiveness of a new drug compared to a traditional one, each patient in an experimental group might be matched with a partner in a control group of the same age, weight, height, sex, occupation, medical history, lifestyle, and so on.
D) All of these.
E) None of these.

Which of the following is a similarity of the t-distribution and the standard normal distribution?

A) There is only one distribution for each.
B) Both distributions are symmetrical.
C) Both distributions are asymmetrical.
D) Both distributions are a function of the sample size.

It is advisable to lock in a term life insurance policy rate at a young age because the cost of life insurance increases as a person ages.

London Drugs purchases digital cameras for $850 less 32% and 6%. Mark-up on cost is 38% and on average operating expenses are 18% of selling price. Determine the profit or loss realized per camera if they are put on sale for $662.34.

David & Dora Footwear Supplies usually tries to take advantage of cash discounts even if it must borrow the money for a few days in order to pay the invoice in time. Compute the savings on David & Dora's purchases and terms from two different suppliers. Use a 365-day year. Assume that the number of interest days is the time between the due date and the last date to take advantage of the cash discount.
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