6. To save time Nivaldo’s chemistry professor grades only 3 randomly chosen problems of a 12-problem assignment. Suppose that Nivaldo has 9 out of 12 problems correct on the assignment. a) Compute the probability that the 3 chosen problems are correct (Nivaldo scores 100%) . b) Compute the probability that all 3 chosen problems are incorrect (Nivaldo scores 0%). c) Compute the expected value of the number of correct problems chosen by the professor.

Psychology 215 – Basic Statistical Methods - Andrzejewski Problem Set #10 Submit a document with the answers to the following questions along with an Excel workbook with the appropriate computations. Be sure to report the appropriate statistics. 1. A cognitive psychologist was interested in the ability to solve puzzles. They selected 24 college sophomores and matched them on the basis of IQ and assigned them, in groups of four, to one of four puzzle conditions (six blocks of four). The psychologist wants to make sure that all the puzzles are equally difficult. The dependent variable was the amount of time it took for a subject to complete the puzzle. The data are presented below. Were there differences in puzzle difficulty at the .05 level? Make sure to complete a 6-step hypothesis test. Block 1 2 3 4 5 -327872 1 25 25 2 34 38 33 32 36 34 Puzzle 3 31 36 30 41 39 40 4 40 37 32 38 46 39

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The market research department at a manufacturing plant determines that 30% of the people who purchase the plant's product during any month will not purchase it the next month. On the other hand, 40% of the people who do not purchase the product during any month will purchase it the next month. In a population of 1000 people, 100 people purchased the product this month. How many will purchase the product next month and in 2 months? (a) next month      _________     people   (b) in 2 months      ________   people