A fast-food company is interested in examining whether reducing the number of menu items will increase revenue. Before rolling out the new menu nationwide, the company wants to test it in some select markets. The company decides to examine the southwest region first. Using the data base that contains information on the locations of all of its franchisees' stores, the company randomly selects a collection of 50 stores. Of the 50, half were given the new menu and half were told to continue using the old menu. Sales from the stores in both groups were tracked for six weeks. After analyzing the data, management concluded, with a high degree of confidence, that using the new menu nationwide would increase revenue by an average of 20 to 30 percent, This conclusion is an example of a (an) .

2

step-by-step explanation:

vvvvv

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.