Vital Statistics: Heights of Men The heights of 18-year-old men are approximately normally distributed, with mean 68 inches and standard deviation 3 inches (based on information from Statistical Abstract of the United States, 112th Edition). (a) What is the probability that an 18-year-old man selected at random is between 67 and 69 inches tall? (b) If a random sample of nine 18-year-old men is selected, what is the probability that the mean height is between 67 and 69 inches? (c) Interpretation: Compare your answers to parts (a) and (b). Is the probability in part (b) much higher? Why would you expect this?
STP 231 lectures covering 2.12.4 I.) 2.1 section about variables. Variables are things that are a part of your study that can be defined. Upper case letters represent the definition of the variable, which could be height, gender, number of home runs, etc. Lower case letters represent values of the variable, which could be six foot tall, number of males, 200 home runs, etc. A. Numeric variable: the variables take on numbers, its quantitative. i. Discrete: a numerical variable with a limit. Like the number of seats in a stadium. ii. Continuous variable: a numerical variable without a limit. Like a measurement be