true or false: in large samples you do not have to worry about omitted variable bias. true false suppose you take a sample of student test scores and develop the following frequency distribution. the histogram has ten bins, with the height in each bin being the proportion of observations falling within the corresponding score interval. (note: in this case, the students who studied did well on the exam and those who didn't scored poorly.) 0 10 20 30 40 50 60 70 80 90 100 0.5 0.4 0.3 0.2 0.1 0 proportion in cell student scores (in percentage form) true or false: the data appear to be normally distributed. true false