PSYC 230 Study Guide Exam 4

PSYC 230 Study Guide Exam 4 - ANOVA Hypothesis testing with...

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ANOVA Hypothesis testing with z, t and F scores - describe the logic of when we reject the null hypothesis f-test: when variance is greater than one t-test: when observed is more extreme than critical Z- test: when observed is more extreme than critical What is a point estimate? - Describe the pros and cons relative to confidence intervals Pro: make comparisons Con: they are just sentiments - Point estimates are a more specific estimation, but less likely to be exactly right - Confidence intervals are more general (range of scores), but more likely to include the best estimate of the population parameter Confidence intervals - Describe what they are for? Say how confident you are - We can be reasonable confident that the population mean falls within this range 11-15 (with either 95% or 99% confidence) X ± (z)( σ ) SEE LAST PAGE FOR EXAMPLE Describe the factors will affect the size of a confidence interval (especially variability, sample size and confidence level) More variability less confidence and bigger range, same with large sample sizes. Describe how we can make our confidence interval smaller? - decrease variability by decreasing random error (gather data carefully) - decrease variability by using a more homogeneous sample (note: problem with generalizability) - decrease level of confidence Level of significance (alpha = α)

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PSYC 230 Study Guide Exam 4 - ANOVA Hypothesis testing with...

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