Socy 4156

Whitmeyer

Spring 2008

Study Guide for Test 2 (Chapters 6, 7, 8)

You should be able to:

Explain the EPSEM property we’re looking for in a sample.

Describe different methods of sampling.

Define a sampling distribution.

Say what the Central Limit Theorem says and why it’s important.

Define “standard error”.

Describe the difference between a point and interval estimate.

Define “unbiased” and “efficient” estimators and give examples.

Calculate 95% and 99% confidence intervals for the mean.

Calculate 95% and 99% confidence intervals for the proportion.

Give the meaning of a confidence interval.

Say the assumptions we make in conducting a 1-sample test.

Conduct a 1-sample test for the mean.

Conduct a 1-sample test for the proportion.

Know when to use normal (Z-) distribution and t-distribution.

Know how to find critical scores for normal and t-distributions.

Know the difference between Type I and Type II error, and which decision runs the risk of which kind of error.