Statistics In Decision Making
Show your work and explain your results to answer each question. Don’t write just a number.
1. Use a random number table to draw a random sample with N = 8 from the following scores.
21, 31, 17, 13, 02, 09, 57, 26, 72, 140, 27, 27, 27, 21, 13, 57, 43, 22, 18, 19, 18, 18, 18, 23, 25, 66, 75, 89, 99, 112.
2. Calculate the standard error of the mean for a sample of 8 for the population in Problem #1. The sumX = 1205 and sumX2 = 82091
3. A teacher was interested in the mathematical ability of graduating high school seniors in her state. She gave a 32-item test to a random sample of 75 seniors from her state with the following results: The sumX = 1275 and sumX2 = 23525. Establish a 95% confidence interval about the mean and write a sentence that explains the interval you found to a high school principal.
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