What is the best way to represent the shape of a large population of measurements?
a. A histogram
b. A frequency curve
c. A bell-shaped curve
d. None of the above
Q. 2Suppose the lengths of a certain species of snake have a normal distribution with a mean of 45 inches. Explain what it means for the snake lengths to have a bell-shaped distribution (use words that a non-statistician would understand).
Q. 3Suppose the lengths of a certain species of snake have a normal distribution with a mean of 45 inches. What percentage of the snakes in this population are 45 inches long or longer?
Q. 4Suppose the lengths of a certain species of snake have a normal distribution with a mean of 45 inches. Draw a picture of the distribution of snake lengths for this population.
Q. 5Are all frequency curves bell-shaped? If yes, explain why. If no, give an example of one that is not.
Q. 6Which of the following methods is the most appropriate one for proving' someone cheated on a multiple choice exam who was allegedly looking at someone else's paper?
a. Examine the two papers and see how many questions they both got wrong, and how many times the same wrong answer was chosen for those questions.
b. Take the student's paper that was allegedly copied from (student X) and compare it to all other students' papers in the class. Take the number of answers that each student matched with student X and make a histogram. Then see where the alleged cheater fell on the resulting histogram.
c. Neither of these methods is appropriate. There is always a chance that two people could have the same answers but no cheating was going on.
d. Both of these methods are equivalent, so either one is appropriate.
Q. 7Which of the following statements is statistically correct?
a. Jimmy is taller than normal for a two-year old..
b. Jimmy is taller than the average two-year old..
c. Jimmy is taller than the average height of two-year olds..
d. All of the above are statistically correct.
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