12-8-08

# 12-8-08 - Psychology 206 Class Notes No confidence interval...

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Psychology 206 – Class Notes – 12/8/08 No confidence interval computations on the final exam, but conceptual questions WILL BE ON THE FINAL EXAM (multiple choice, fill in the blank) Exercise #30 – KNOW THIS FOR THE FINAL EXAM (don’t have to calculate, but know conceptually!) 1. What does it mean to have a 95% confidence interval? a. When we construct a 95% CI, we create a range of values (an interval) which has a .95 probability of including µ (the true mean of the population). 2. There is an interpretation of the 95% confidence interval that sounds similar, but is incorrect. a. SUPER IMPORTANT . It is incorrect to attach the probability to µ, it IS CORRECT to attach the probability to the interval we construct. The population mean DOES NOT CHANGE (it exists, we just don’t know it). Confidence intervals change from sample to sample. Every (random) sample we draw from the population has its own confidence interval. o However, 95% OF THE CONFIDENCE INTERVALS includes the true value of the population mean.

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