Alexander is a stockbroker. He earns 13% commission each week. Last week, he sold $7,000 worth of stocks. How much did he make last week in commission? If he averages that same amount each week, how much did he make in commission in 2011?

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?