1) 1000 high school juniors took the ACT. The scores were normally distributed with a mean of 21 and a SD of 5. Using the empirical rule what percent of the scores fell within 16 and 31? a) 68% b) 81.5% c) 99.7% d) 95% e) 84% 2) Which of the following is NOT an example of a Simple Random Sample? a) Mrs. Burnett puts the names of each of her students on a slip of paper and places each in a hat, she then shakes the hat and finally selects one slip of paper from the hat. b) Mr. Scruggs uses an online platform that has a wheel to randomly select one student for a prize, he places all of his students names on the wheel then clicks the button for it to randomly select one student from the wheel. c) The DECA organization wants to see who is interested in joining the club. 400 people are randomly sampled 100 of which being freshmen, 100 sophomores, 100 Juniors, and 100 Seniors. d) Coach Battenfield is trying to determine who the Captains will be for the first basketball game next season. He assigns each player a number and then uses a random number generator to obtain a number. Whoevers number is randomly chosen will be captain for the first game.  e) All of theese are examples of a Simple Random Sample 3) What conditions need to be met in order to perform a Chi-Squared test for independence? a) It needs to be a random sample b) It needs to be less than 10 percent of the population or each subject has to be independent of each other c) All of the expected values need to be larger than 5 d) All of these conditions need to be met e) None of these conditions need to be met 4) Which of the following scatterplots has the strongest positive correlation? a) b) c) d) e) 5) You flip a fair, two-sided coin four times. What is the probability that the coin lands on heads exactly three times? a) P(X=3) and 4/16 or .25 b) P(X=3) and 3/4 or .75 c) P(X=3) and 4/12 or .33 d) P(X=3) 3/8 or .375 e) None of the above answer choices are correct 6) Lifetime Fitness has approximateley 1,000 members, 700 of those members live in Colleyville. 200 of the club members drive a Mercedes Benz and 100 of the club members live in Colleyville and drives a Mercedes Benz. What proportion of club members are from Colleyville but do not drive a Mercedes Benz? a) .10 b) .70 c) 1 d) .60 e) None of the above options 7) What is the interquartile range for the following data set? 84,82,47,23,98,37,29,53,64,34  a) 84(Q3)-47(Q1)= 37(IQR) b) 98(Q3)-23(Q1)= 75(IQR) c) 47(Q1)-84(Q3)= -37(IQR) d) 23(Q1)-98(Q3)= -75(IQR) 8) Ely takes a survey of four classrooms at Chhs. Ely surveys students in Mr. Scruggs's class, Ms. Smiths class, Coach Mckinney's class, and Mr Mendoza's class to see which school sport is their students favorite to watch. What type of sample is this? a) Simple Random Sample b) Cluster Sample c) Stratified Random Sample d) Convenience Sample e) Systematic Random Sample

AP Statistics, AP Test Review

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