Question 19 (1 point) Answer the question True or False. An outlier may be caused by accidentally including the height of a sixyear-old boy in a set of data representing the heights of 12-year-old boys. Question 20 (1 point) Solve the problem. A study was designed to investigate the effects of two variables (1) a student's level of mathematical anxiety and (2) teaching method on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 500 with a standard deviation of 20 on a standardized test. Assuming a non moundshaped distribution, what percentage of the students scored over 560? wgJWL'P\" O at most 5.5% 0 approximately 2.5% O at least 89% O at most 11%