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Chapter 3 Descriptive Statistics

 

3.1 Measures of Locations

 

            Mean

            Median

            Mode

            Percentile

            Quartiles

 

Home Work

 

  1. Consider the data values of 10, 20, 12, 17, and 16. Compute the mean and median
  2. Consider the sample size 8 with values of 27,25,20,15,30,34,28, and 25. Compute the 20th, 25th, 65th, and 75th percentiles.
  3. consider a sample with the data values of 53,55,70,58,64,57,53,69,57,68,53. Compute the mean, median and mode.

 

Application Home Work (DO IT ON EXCEL)

 

  1. According to a salary survey conducted by the National Associated of Colleges and Employers, Bachelor’s degree candidates in accounting receive starting offers averaging $34,500 per year (Bureau of Labor Statistics). A sample of 30 students who graduated in 2000 with a bachelor’s degree in accounting resulted in the AcctStal.xls file. Data are in thousands of dollars.

a.       What is the mean starting salary

b.       What is the median starting salary

c.       What is the mode

d.       What is the first quartile

e.       What is the third quartile

 

  1. Because of recent technological advantages, today’s digital cameras better-looking pictures than did their predecessors a year ago. The excel file Cameras.xls show the street price, maximum picture capacity, and battery life (minutes) for the least models (PC World, January 2000)
    1. Compute the mean price
    2. Compute the mean maximum picture capacity
    3. Compute the mean battery life
    4. If you had to select one camera from this file, what camera would you choose? Explanin.