Chapter 12: Analysis of Quantitative Data. Introduction Dealing with Data: Coding, Entering, and Cleaning Descriptive Statistics One Variable Two Variables More than Two Variables Inferential Statistics Conclusion. Introduction. Data collected in quantitative research is in the form of
We survey seven people and ask each how many alcoholic drinks he or she consumed in the past month. The results are
Person 1 2 3 4 5 6 7
Drinks 0 1 3 4 5 6 80
The median number is 4 – three people consumed fewer, and three people consumed more
The mean number is 14.14: the total number of drinks is 99, divided by 7 people is 14.4
From this example, you can see how ‘outliers’ – extreme values – affect the mean much more than the median.
chi (squared), and rho.
measures the combined influence of multiple independent variables on one dependent variable
(using probability theory)
2. Determine how confident one is in making inferences from a sample to a population
3. Test whether descriptive results are likely to be due to:
- real relationship, or
- random factors