week 5 inidvidual exercise questions

# week 5 inidvidual exercise questions - Exercises from the...

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Exercises from the E-Text 1 Exercises from the E-Text Fadi Fayad RES/341 02/03/2011 Morris Hamm

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Exercises from the E-Text 2 Exercises from the E-Text 8.46 3.3048 is the sample mean= x with line over it. 1.32 is the standard deviation 1.833 is the “t” value** 10 is the sample size 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 Page 309 3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477 (a) Construct a 90 percent confidence interval for the true mean weight. A confidence interval looks like (x-bar-E < u < x-bar+E) E is the margin of error and equals t * [s/sqrt(n)] Your E = 1.833[1.32/sqrt(10)] = 0.76513. .. Your 90% CI is (3.3048-0.76513 < u < 3.3048+0.76513) This can be simplified: (2.5397 < u < 4.06993) (b) What sample size would be necessary to estimate the true weight with an error (+ or -) 0.03 grams with 90 percent confidence? E = t * [s/sqrt(n)]
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## This note was uploaded on 06/20/2011 for the course RESEARCH 341 taught by Professor Amy during the Spring '11 term at University of Phoenix.

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week 5 inidvidual exercise questions - Exercises from the...

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