Question

Emerald^® Designer Edition^TM is Sherwin Williams’ “finest interior architectural coating” (or, more commonly, paint). Drying time is stated to be temperature and humidity dependent: for recoating: 4 hours, assuming 77^o F and 50% relative humidity.

A contractor records relative humidity and drying time for ten recent jobs as shown at right.

1. Based on the relative humidity, what is the least squares regression equation for the drying time for this paint?
2. What percentage of the variation in drying time is explained by variation in relative humidity?
3. Using your least squares estimator, what drying time would you expect on a day with 65% relative humidity?

Relative Humidity (percent)	Drying time (hours)
53	4.6
73	4.6
63	5.0
56	5.0
50	3.8
74	5.1
73	5.3
54	4.0
57	4.5
73	4.8

Answer 1

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