Bidri is a popular and traditional art form in India. Bidri articles (bowls, vessels, and so on) are made by casting from an alloy containing primarily zinc along with some copper. Consider the following observations on copper content (%) for a sample of Bidri artifacts in London’s Victoria and Albert Museum (“Enigmas of Bidri,” Surface Engineering [2005]: 333– 339), listed in increasing order: 2.0 2.4 2.5 2.6 2.6 2.7 2.7 2.8 3.0 3.1 3.2 3.3 3.33.4 3.43.6 3.6 3.63.6 3.74.4 4.64.7 4.85.3 10.1

a. Construct a dotplot for these data.

b. Calculate the mean and median copper content.

c. Will an 8% trimmed mean be larger or smaller than the mean for this data set? Explain your reasoning.

CR5.8 Medicare’s new medical plans offer a wide range of variations and choices for seniors when picking a drug plan (San Luis Obispo Tribune, No vem ber 25, 2005). The monthly cost for a stand-alone drug plan can vary from a low of $1.87 in Montana, Wyoming, North Dakota, South Dakota, Nebraska, Minnesota, and Iowa to a high of $104.89. Here are the lowest and highest monthly premiums for stand-alone Medicare drug plans for each state:

Which of the following can be determined from the data? If it can be determined, calculate the requested value. If it cannot be determined, explain why not.

a. the median premium cost in Colorado

b. the number of plan choices in Virginia

c. the state(s) with the largest difference in cost between plans

d. the state(s) with the choice with the highest premium cost

e. the state for which the minimum premium cost is greatest

f. the mean of the minimum cost of all states beginning with the letter “M”

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State $ Low $ High Alabama 14.08 69.98 Alaska 20.05 61.93 Arizona 6.14 64.86 Arkansas 10.31 67.98 California 5.41 66.08 Colorado 8.62 65.88 Connecticut 7.32 65.58 Delaware 6.44 68.91 District of Columbia 6.44 68.91 Florida 10.35 104.89 Georgia 17.91 73.17 Hawaii 17.18 64.43 Idaho 6.33 68.88 Illinois 13.32 65.04 Indiana 12.30 70.72 Iowa 1.87 99.90 Kansas 9.48 67.88 Kentucky 12.30 70.72 Louisiana 17.06 70.59 Maine 19.60 65.39 Maryland 6.44 68.91 Massachusetts 7.32 65.58 Michigan 13.75 65.69 Minnesota 1.87 99.90 Mississippi 11.60 70.59 Missouri 10.29 68.26 Montana 1.87 99.90 Nebraska 1.87 99.90 Nevada 6.42 64.63