Which option accurately describes an unbalanced force?

a) each cement block supports a2-n force, but when the foundation is built in a staggered pattern it can support 2,000 n

b) three rows of cement blocks form a foundation for a house, and the house rests on this foundation

c) a 2-n force presses down on the cement block at the same time as a 1.5-n force presses up on the cement block

d) the force of a house pressing down on its foundation of cement blocks is 3,000 n.

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?