13 Two divergent lines make an angle of 60 between them. Bisect the angle
and on the bisector, draw another vertical bisector at point 60 mm from
the base angle of the diverging lines. Draw another circle to touch the
initial circle tangentially and to touch the two divergent lines.​

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?