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Unformatted text preview: STAT 3502 Solution for assignment # 1 Total mark=25 1. For hard drives to operate properly, the distance between the read/write head and the disk must remain between tight limits. From each hour’s production, 40 drivers are selected and the distance is measured. Identify the population unit, variable of interest, statistical population and sample. [ 2 marks ] Sol: Unit: hard drive. Variable: distance. Population: distances for drives made in one hour. Sample: distances for 40 drives. 2. The values of the variable x = total length of streets within a subdivision are: 1280, 5320, 4390, 2100, 1240, 3060, 4770, 1050, 360, 3330, 3380, 340, 1000, 960, 1320, 530, 3350, 540, 3870, 1250, 2400, 960, 1120, 2120, 450, 2250, 2320, 2400, 3150, 5700, 5220, 500, 1850, 2460, 5850, 2700, 2730, 1670, 100, 5770, 3150, 1890, 510, 240, 396, 1419, 2109 a. Construct a stemandleaf plot using the thousands digit as the stem and the hun dreds digit as the leaf, and comment on the various features of the display. [ 2 marks ] b. Construct a histogram using class boundaries 0, 1000, 2000, 3000, 4000, 5000, and 6000 . What proportion of subdivisions have total length less than 2000? Between 2000 and 4000? How would you describe the shape of the histogram? [ 2 marks ] Sol: 1 3. Anxiety disorders and and symptoms can often be effectively treated with benzodi3....
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This note was uploaded on 09/27/2010 for the course STAT 104157 taught by Professor Jhonbran during the Spring '09 term at California Coast University.
 Spring '09
 JHONBRAN

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