Stats week 8 - Sarah Anderson Stats week 8 Exercises 2, 5...

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Sarah Anderson Stats week 8 Exercises 2, 5 done(page 297) Exercises 11 done 12 (page 304 – 305) Exercise 16 (page 308) done Exercise 20 (page 310) done Exercises 26, 28 done (page 313) 2.) the confidence interval is: (40-1.64*5/9 , 40+1.64*5/9) 5.) a. $20. It is our best estimate of the population mean. b. $18.60 and $21.40, found by $20 +- 1.96($5/sq root of 49. About 95% of the intervals similarly constructed will include the population mean. 11.) The population mean is unknown, but the best estimate Is 20, the sample mean. 12.) ANSWER: 90% Resulting Confidence Interval for 'true mean': = [51, 69] Why??? SMALL SAMPLE, CONFIDENCE INTERVAL, NORMAL POPULATION DISTRIBUTION x-bar = Sample mean 60 s = Sample standard deviation 20 n = Number of samples 16 df = degrees of freedom 15 significant digits 1 Confidence Level 90 "Look-up" Table 't-critical value' 1.8 Look-up Table of t critical values for confidence and prediction intervals. Central two-side area = 90% with df = 15. Another Look-up method is to utilize Microsoft Excel function:
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This note was uploaded on 04/12/2011 for the course STAT 2610 taught by Professor Sanjeev during the Spring '11 term at Bemidji State.

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Stats week 8 - Sarah Anderson Stats week 8 Exercises 2, 5...

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