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RES 341 Week 5 E-Text

# RES 341 Week 5 E-Text - Week 5 Revised E-text Assignment(3...

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Week 5 Revised E-text Assignment: (3 pts): Due August 2, 2010. Directions: Each question is worth 1.5 points. You may include the statistical software output, but you must also include a well-written explanation of the findings. Be sure to answer the question asked in each problem, and explain why, with reference to your output. If you calculate the answers manually, be sure to show your work. I would prefer a Word document with your answers below each problem, but you may also submit an Excel document. 1: (8.46) A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were 3.28 3.25 3.25 3.43 3.23 3.36 3.17 3.29 3.57 3.31 (a) Construct a 99 percent confidence interval for the true mean weight. The sample mean = (3.28+3.25+3.25+3.43+3.23+3.36+3.17+3.29+3.57+3.31)/10= 3.32 x x - mean (x – mean)² 3.28 -0.04 0.0016 3.25 -0.07 0.0049 3.25 -0.07 0.0049 3.43 0.11 0.0121 3.23 -0.09 0.0081 3.36 0.04 0.0016 3.17 -0.15 0.0225 3.29 -0.03 0.0009 3.57 0.25 0.0625 3.31 -0.01 0.0001 the sum of all the (x-mean)² is the standard deviation squared (σ²) thus σ²=0.1192 thus σ= 1192 . 0 = 0.3452

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From a table ( http://davidmlane.com/hyperstat/t_table.html
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RES 341 Week 5 E-Text - Week 5 Revised E-text Assignment(3...

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