CMST 332 Chapter Notes - Chapter 9: Statistical Inference, Normal Distribution, Central Tendency

• School: Chico State University
• Department: Communication Studies
• Course: CMST 332
• Professor: Michelle Givertz

Document Summary

Ch 9: descriptive statistics, significance levels, & hypothesis testing. Numbers into statistics: raw data: numerical data. Collected from ea. partic. is compiled into dataset (collection of raw data for the same variables: descriptive statistics: convey basic info. about ea. variable/dataset as a whole. Mean, standard deviation, range, & # of cases used to provide summary interp. of ea. variable. Inferential statistics: # used to provide info. about relationships between/among variables in study to help researchers draw conc. about pop. by examining data of the sample. Normal curve: comparison of data collected form many indiv. on 1 variable > interp. score from 1 indiv. on 1 variable, normal curve: aka bell curve; theoretical distrib. of scores/oth. numerical values. Basis of hyp. testing & inferential statistics. Horizontal axis all poss. values of variable. Vertical axis relative freq. w/which those values occur. Skewed distributions: skewed distribution: (cid:449)he(cid:374) distri(cid:271). of s(cid:272)ores is(cid:374)"t normal.