Mathematics, 24.03.2020 20:08 leenzazou98241
Guessing on a Test The designers of a true-false test would like to find out how a student would perform if the student just guessed all the answers at random. (Designers of multiple-choice tests like the SAT have to consider this issue as well.) There are 100 questions on the test. One point is awarded for each correct answer and 1 point is taken away for any other kind of answer (wrong, missing, ambiguous, or anything other than correct). The test designers have figured out that the number of questions the student gets right by guessing at random has expectation 50 and SD 5 a) Let W be the number of questions the student does not get right. Find E(W) and SD(W). b) Let S be the student's score on the test. Find E(S) and SD(S).
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What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)
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Officer brimberry wrote 32 tickets for traffic violations last week, but only 4 tickets this week. what is the percent decrease? give your answer to the nearest tenth of a percent.
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Guessing on a Test The designers of a true-false test would like to find out how a student would per...
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