Week 6 classnotes Hypothesis testing_inference_rev 2_28_09

Week 6 classnotes Hypothesis testing_inference_rev 2_28_09...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 SAN JOSÉ STATE UNIVERSITY College of Social Work S. W. 242 Spring 2008 Edward Cohen Week 6: Hypothesis Testing continued; Chi Square Test of Association Concepts you should know: Statistical inference Theoretical sampling distribution Null hypothesis Research, or alternative, hypothesis One-tailed vs. two-tailed hypotheses Type I and Type II errors Statistical significance Critical region Alpha level p value Parametric statistics Non-parametric statistics Binomial distribution Chi-squared test of association Expected frequencies Observed frequencies Degrees of freedom I. The Logic of Statistical Inference--Testing Hypotheses A. Confirming your research hypothesis (relationship between 2 variables) is dependent on ruling out 1. Rival hypotheses 2. Research design problems (e.g. measurement error, non-representative sample), and/or 3. Chance— sampling error --the natural tendency of any sample to differ from the population from which it was drawn. This one is what statistical inference deals with. B. Statistical Inference--The use of theoretical sampling distributions to test hypotheses 1. Theoretical sampling distribution: the normal curve showing all possible sample statistics produced from an infinite number of randomly drawn samples 2. Theoretical sampling is based on the premise that no relationship exists between the two variables (e.g. that the statistical outcome is only obtained by chance)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 3. Statistical inference tests the null hypothesis --a statement that there is no relationship between two variables of interest. Another way of saying it: Any relationship between these variables is only due to chance , not a real relationship that exists in the population 4. The research hypothesis , or alternative hypothesis, states that there is a relationship between the variables a) Hypotheses: one-tailed or two-tailed? b)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/08/2010 for the course SCWK 298 at San Jose State University .

Page1 / 6

Week 6 classnotes Hypothesis testing_inference_rev 2_28_09...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online