A box contains buttons of five different colors, and there are 10 buttons of each color. Each button is the same size as the others. If you are blindfolded, how many buttons must you select from this box to make sure that you have four buttons of the same color.

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?