Week 1 Solutions Ch2(1)

# Week 1 Solutions Ch2(1) - Solutions to Chapter 2 Chapter 2...

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Solutions to Chapter 2. Chapter 2: # 2.3, 2.4, 2.7, 2.12, 2.15, 2.16, 2.17, 2.19, 2.20, 2.23, 2.26, 2.27, 2.30, 2.37 2.3 CPI percentage growth forecasts: 3.0, 3.1, 3.4, 3.4, 3.5, 3.6, 3.7, 3.7, 3.7, 3.9 a. Compute the sample mean 35 3.5 10 i x x n b. Compute the sample median = middlemost observation: 3.5 3.6 3.55 2 c. Mode = most frequently occurring observation = 3.7 2.4 Department store % increase in dollar sales: 2.9, 3.1, 3.7, 4.3, 5.9, 6.8, 7.0, 7.3, 8.2, 10.2 a. Mean 59.4 5.94 10 i x x n Median = middlemost observation: 5.9 6.8 6.35 2 c. The distribution is relatively symmetric since the mean of 5.94 is relatively close to the median of 6.35. Since the mean is slightly less than the median, the distribution is slightly skewed to the left. 2.7 Find the measures of central tendency for the number of defects in a sample of 50 radios Mean number of defects = 0(12) 1(15) 2(17) 3(6) 50 = 1.34 defects per radio Median = 1 (middlemost observation in the ordered array), Mode = 2 (most frequently occurring observation) 2.12 The variance and standard deviation are 143 . 5 7 36 1 ) ( 2 2 n x x s i and s = 2.268 2.15 The time that a sample of employees took to complete a task Variable N N* Mean SE Mean TrMean StDev Variance CoefVar Minimum Ex2.15 24 0 28.96 2.77 28.05 13.57 184.13 46.86 12.00

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## This note was uploaded on 10/27/2011 for the course ECO 205 taught by Professor T.r.b. during the Spring '08 term at Arizona.

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Week 1 Solutions Ch2(1) - Solutions to Chapter 2 Chapter 2...

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