PSCI 2702 Lecture Notes - Standard Deviation, Null Hypothesis, Statistical Hypothesis Testing

• School: Carleton University
• Department: Political Science
• Course: PSCI 2702
• Professor: Andrea Wagner

Document Summary

Class 6 psci2702a february 12, 2014. Statistical significance = sample generalizable to whole population. Null hypothesis backs up random chance, research hypothesis backs up statistical significance. In hypothesis testing 2, you have two populations and two representative samples: in data set, calculate two averages and see if there is a difference between the two. E. g. , average income of men vs average income of women. Analyze compare means independent samples t test, the test variable is always the variable you are testing for (where you can calculate a mean or interval e. g. , income. In data set, nmales = 1357 and nfemales = 1470. For income, avgmales = 36419. 80, avgfemales = 19878. 99. Men out earn women on avg by 16,000/year. Standard deviation tells us the dispersion around the mean for the two sample groups. High standard deviation = some men make a lot less than the average, and some make a lot more than the average; diversity in salaries.