Two school employees, Val and Lee, seek to determine the average height of the school's 1500 students (the population), but measuring all 1500 would take too much time.
Val measures 36 random students and gets an average height of 48 inches (std dev 8).
Lee measures 100 random students and gets an average height of 50 inches (std dev 8).
Stu is also asked to determine the school's average height. Stu is lazy and just measures 4 random students, getting an average height of 55 in (std dev 8) and a margin of error of _____.
A. 4
B. 7.8
