Chapt6 - f) What IQ score is at the 95 th percentile? g)...

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Statistics In Class Examples – Chapter 6 30. What percent of a standard Normal model is found in each region? Draw a picture first. a) 05 . 2 - z b) 33 . 0 - < z c) 8 . 1 2 . 1 < < z d) 28 . 1 < z 18, 20, 34, 36 & 38. Some IQ tests are standardized to a Normal model, with a mean of 100 and a standard deviation of 16. a) Draw the model for these IQ scores. Clearly label it, showing what the 68-95-99-99.7 Rule predicts about the scores. b) In what interval would you expect the central 95% of IQ scores to be found? c) About what percent of people should have IQ scores above 116? d) About what percent of people should have IQ scores between 68 and 84? e) About what percent of people should have IQ scores above 132?
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Unformatted text preview: f) What IQ score is at the 95 th percentile? g) What IQ would you consider to be unusually high? Explain your answer. h) What percent of people’s IQs would you expect to be over 80? i) What percent of people’s IQs would you expect to be under 90? j) About what percent of people should have IQ scores between 112 and 132? k) What is the IQR of the IQs? 31. Every Normal model is defined by its parameters, the mean and the standard deviation. For each model described below, find the missing parameter. Don’t forget to draw a picture. a) 1250 = μ , 35% below 1200; ? = σ b) 220 = , 3% below 202; ? =...
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This note was uploaded on 04/12/2011 for the course STA 215 taught by Professor Tba during the Spring '08 term at Grand Valley State.

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