Grace's retirement party costs $2plus an additional $1 for each guest she invites. What is the maximum numbe of guests there can be Grace can afford to spend a total of $15 on her retirement party?

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?