T F The median of a dummy variable will always be either 0 or 1. T F A single price relative can be compared meaningfully to the consumer price index so long as they both have the same base year.

T F The numerator of the Laspeyres index is the counterfactual or hypothetical expenditure that cannot actually be observed at any point in time.

T F The rate of inflation over time in Hermosillo, Mexico can legitimately be compared with the rate of inflation in Casablanca, Morocco using consumer price indices from each place.

T F If the covariance of height and weight is positive, the correlation between the two variables must also be positive.

T F If deflation (deflation is the opposite of inflation) occurs from one month to the next, the values of the (Laspeyres) consumer price index must have declined.

Also with a written reason, please

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a. she will receive a refund of $278.

step-by-step explanation:

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.