MATH 218 Study Guide - Midterm Guide: Null Hypothesis, Test Statistic, Probability Distribution
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Every numerical answer should be simpli ed to a fraction or a decimal, unless otherwise stated. You must show your work and justify your methods to obtain full credit. Use the continuity correction wherever it is appropriate unless otherwise instructed. If you can"t do one part of a problem but need that answer later, guess an answer and use that guess for the later part. The exam is worth a total of 200 points. Problem 1. (15 points) a certain investor is interested in a group of 30 stocks. 7 stocks are up since the previous trading day and the prices of 6 stocks are down. When appropriate, you may leave your answer in terms of factorials. (a) suppose one stock is selected at random. Let a represent the event that a stock traded on the nyse is chosen, and let b represent the event that a stock whose price has risen is chosen.
