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Chapter 11 33. The manufacturer of an MP3 playe...

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Chapter 11 33. The manufacturer of an MP3 player wanted to know whether a 10 percent reduction in price is enough to increase the sales of its product. To investigate, the owner randomly selected eight outlets, the MP3 player was sold at the regular price. Reported below is the number of units sold last month at the sampled outlets. At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales? Regular price 138 121 88 115 141 125 96 Reduced price 128 134 152 135 114 106 112 39. An investigation of the effectiveness of an antibacterial soap in reducing operating room contamination resulted in the accompanying table. The new soap was tested in a sample of eight operating rooms in the greater Seattle are during the last year. Operating Room A B C D E F G H BEFORE 6.6 6.5 9.0 10.3 11.2 8.1 6.3 11.6 AFTER 6.8 2.4 7.4 8.5 8.1 6.1 3.4 2.0 At the .05 significance level, can we conclude the contamination measurements are lower after use of the new soap? Chapter 12 23. The City of Maumee comprises four districts. Chief of Police Andy North wants to determine whether there is a difference in the mean number of crimes committed among the four districts. He recorded the number of crimes reported in each district for a sample of six days. At the .05 significance level, can the chief of police conclude there is a difference in the mean number of crimes? Number of Crimes Rec Center Key Street Monclova Whitehouse 13 21 12 16 15 13 14 17 14 18 15 18 15 19 13 15 14 18 12 20 15 19 15 18 31. Listed below are the weights (in grams) of a sample of M&M?s Plain candies, classified according to color. Use a statistical software system to determine whether there is a difference in the mean weights of candies of different colors. Use the .05 significance level. Red Orange Yellow Brown Tan Green 0.946 0.902 0.929 0.896 0.845 0.935 1.107 0.943 0.960 0.888 0.909 0.903 0.913 0.916 0.938 0.906 0.873 0.865 0.904 0.910 0.933 0.941 0.902 0.822 0.926 0.903 0.932 0.838 0.956 0.871 0.926 0.901 0.899 0.892 0.959 0.905 1.006 0.919 0.907 0.905 0.916 0.905 0.914 0.901 0.906 0.824 0.822 0.852 0.922 0.930 0.930 0.908 0.965 1.052 0.883 0.952 0.833 0.898 0.903 0.939 0.895 0.940 0.882 0.906

 

Paper#13519 | Written in 18-Jul-2015

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