3. A small office building is to contain 500 ft squared of floor space. The simple floor plans are shown in the figure. If the wall cost $100 per running foot, find the dimensions
which minimize the cost of the walls.
x
13
X=
Y=
What is the minimum cost?

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?