# chap 3-4 - CHAPTER 3 25 The unemployment rate in the state...

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CHAPTER 3 25. The unemployment rate in the state of Alaska by month is given in the table below: a. What is the arithmetic mean of the Alaska unemployment rates? 7.5 (90.4/12) b. Find the median and the mode for the unemployment rates. Median = 7.45 Mode = 6.5,7.3,7.8,n and 8.7) they all appear 2 times each c. Compute the arithmetic mean and median for just the winter (Dec–Mar) months. Is it much different? Mean = 8.45 ( 33.8/4) Median = 8.7, its higher in winter. 45. Plywood, Inc., reported these returns on stockholder equity for the past 5 years: 4.3, 4.9, 7.2, 6.7, and 11.6. Consider these as population values. a. Compute the range, the arithmetic mean, the variance, and the standard deviation. Range = 7.3 (11.6 – 4.3) Mean = 6.94 (34.7/5) Variance = 6.5944 (32.972/5) Standard deviation = 2.568 (square root of 6.5944) b. Compare the return on stockholder equity for Plywood, Inc., with that for Dennis Industries cited in Exercise 44. Dennis has a higher mean return (11.76 > 6.94). Dennis has a greater spread in its returns on equity (16.89 > 6.59) 54. The mean income of a group of sample observations is \$500; the standard deviation is

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## This note was uploaded on 10/15/2009 for the course ECON 2302 taught by Professor Parker during the Spring '09 term at University of Texas-Tyler.

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chap 3-4 - CHAPTER 3 25 The unemployment rate in the state...

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