Exam3Reviewanswers

Exam3Reviewanswers - Exam 3 Review answers 1. 3. 4. 5. 6....

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Exam 3 Review answers 1. (8.43, 11.97) since σ is known us it rather than s a. We are 92% confident that the population average time that children who need braces wear braces is between 9.74 and 10.66 months. 3. a. 0.58 b. (0.57, 0.59) 4. a. Ho: µ < 259 Ha: µ > 259 b. Ho: p = 0.35 Ha: p ≠ 0.35 5. a 6. Ho: µ > 300 Ha: µ < 300 pvalue = 0.99 Don’t reject Ho. The average cost of textbooks per quarter is at least $300. Type I error: I believe the cost of textbooks per quarter is less than $300, when, in fact, it is at least $300. Type II error: I believe the cost of textbooks per quarter is at least $300, when, in fact it is less than $300. 7. Ho: p > 0.47 Ha: p < 0.47 pvalue = 0.1099 Don’t reject Ho. The approval rating is at lest 47%. Type I error: To believe that the percent is less than 47%, when, in fact, it is at least 47%. Type II error: To believe that the percent is at least 47%, when, in fact, it is less than 47%. 8.
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This note was uploaded on 11/27/2011 for the course MATH 10 taught by Professor Plum during the Fall '11 term at DeAnza College.

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