An equation can be used to represent a real-world situation where one number is unknown,
not provided or may change. That number is replaced by a variable. Let's say Kerry and her
sister Moira were selling raffle tickets for a school fundraiser, Moira sold si tickets, and they
sold 72 tickets in all To find out how many tickets Kerry sold, we can make an equation with
a variable: 51 (the number of tickets Moira sold) + % (the unknown number of tickets Kerry
sold) = 72 (the total number of tickets sold). Any variable, from a to z, can be used to
represent Kerry's tickets here, it doesn't have to be

The vice president of programming at nbc is finalizing the prime-time schedule for the fall. she has decided to include a hospital drama but is unsure which of two possibilities to select. she has a pilot called the surgeon and another called critical care. to her make a final decision, a sample of 20 viewers from throughout the united states was asked to watch the two pilots and indicate which show they prefer. the results were that 12 liked the surgeon, 7 liked critical care, and one had no preference. state the decision rule, using the 0.10 significance level. h0: π = 0.50 h1: π ≠ 0.50 1. reject h0 if number of + signs is either < = or > = 2. what is your decision regarding h0? is there a preference for one of the two shows?