Answer Happy

A new formula for estimating the water evaporation from occupied swimming pools was proposed and analyzed in an engineering journal. The key components of the new formula are number of pool occupants, area of pool's water surface, and the density difference between room air temperature and the air at the pool's surface. Data were collected from a wide range of pools for which the evaporation level was known. The new formula was applied to each pool in the sample, yielding an estimated evaporation level. The absolute value of the deviation between the actual and estimated evaporation level was then recorded as a percentage. The researchers reported the following summary statistics for absolute deviation percentage: x=20.1, s = 19.2. Assume that the sample contained n = 15 swimming pools. Answer parts and b below. C a. Estimate the true mean absolute deviation percentage for the new formula with a 95% confidence interval. (Round to two decimal places as needed.) b. The handbook of a certain engineering society also provides a formula for estimating pool evaporation. Suppose the handbook's mean absolute deviation percentage is μ = 44%. On average, is the new formula better than the handbook's formula? Explain. than the handbook's formula because u is The new formula is