Sociology 2205A/B Lecture Notes - Lecture 5: Standard Score, Second Doctor, Sampling Distribution

• School: Western University
• Department: Sociology
• Course: Sociology 2205A/B
• Professor: Ryan Broll

Document Summary

Lecture 5: estimation procedure: point estimates and confidence intervals. Statistics calculated from random samples are used to estimate the value of population parameters. Basic logic of estimation: sample population, statistic parameter, sample sampling distribution population. Two estimation procedure: a point estimate is a sample statistic used to estimate a population, ex. A newspaper story reports that 15% of a sample of randomly selected. Bias: knowing that sample means and proportions are unbiased allows us to determine the probability that they lie within a given distance of the population parameter we are trying to estimate. Efficiency: ex, this graph is more efficient than the top one. Constructing point estimates: draw an epsem, calculate either a proportion or a mean, estimate that the population parameter is the same as the sample statistic. Alpha: what is the acceptable level of risk for being wrong. Alpha (a: other common alpha levels: 0. 10, 0. 01, 0. 001, find the corresponding z scores for these alpha levels.