COMM 217 Chapter 3: CHAPTER 3 DESCRIBING DATA USING NUMERICAL MEASURES.docx

• School: Concordia University
• Department: Commerce
• Course: COMM 217
• Professor: Fassil Nebebe

Document Summary

Parameter: a measure computed from the entire population, as long as the population does not change, the value of the parameter will not change. Statistic: a measure computed from a sample that has been selected from a population, the value of the statistic will depend on which sample is selected. The average for all values in the population computed by dividing the sum of all values by the population size. The average for all values in the sample computed by dividing the sum of all sample values by the sample size. The median is a center value that divides a data array into two halves (md) Data array: data that has been arranged in a numerical order. In an ordered array (lowest to highest), the median is the middle number: 50% of the data is above the median, 50% below, represented as md, the median is not affected by extreme values. Step 2: sort data from smallest to largest.