Juan sells hats and t-shirts for students to wear to athletic events at his school. Yesterday, he sold 23 baseball caps and 20 t-shirts. He earned $200 from t-shirts sales and $287.50 from baseball caps. What is the cost of each baseball cap?

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?