MATH200 — Practice Quiz: Chapter 3 — 35 min
Work this like a regular quiz, using only your crib sheet. Give yourself a maximum of 35 minutes, then turn to the solutions and see how you did.
Remember, you must show your work for full credit on any problems involving computation.
2(points: 2½) Mensa, the largest high-IQ society, accepts SAT scores as indicating intelligence. Assume that the mean combined SAT score is 1500, with standard deviation 300. Jacinto scored a combined 2070.
Maria took a traditional IQ test and scored 129. On that test, the mean is 100 and the standard deviation is 15.
From the test scores, who is more intelligent? Explain.
|Test Scores||Frequencies, f|
4(points: 5) At right is a sample shown as a grouped frequency distribution. Compute the following quantities and label each with its proper symbol: (a) sample size, (b) mean, (c) standard deviation. Round to two decimal places.
Use any valid method, but show your work. (Begin by filling in the third column including column heading.)
135,512 149,143 140,794
153,146 99,000 136,924
136,833 115,000 124,757 128,429 157,216 149,380 136,529
Compute the five-number summary and make a box plot. (You might want to do that on your TI-83 and copy the plot to your paper.)
Solutions to this practice quiz are available at http://www.tc3.edu/instruct/sbrown/stat/