Presentation on theme: "Hypothesis Testing with z Tests Chapter 7. The z Table >Benefits of standardization: allowing fair comparisons >z table: provides percentage of scores."— Presentation transcript:
Check Your Learning >If the population mean is 10 and the standard deviation is 2: What is the percentile rank of a sample mean of 6? of 11? What percentage of the samples would score higher than a score of 6? of 11?
The Assumptions and the Steps of Hypothesis Testing >Requirements to conduct analyses Assumption: characteristic about a population that we are sampling necessary for accurate inferences
Parametric v. Nonparametric Tests >Parametric tests: inferential statistical test based on assumptions about a population >Nonparametric tests: inferential statistical test not based on assumptions about the population
Check Your Learning >IQ scores are designed to have a mean of 100 and a standard deviation of 15. Assume the class mean is 114. Go through the six steps of hypothesis testing.
“Dirty” Data >“Dirty” Data: Missing data, misleading data, and outliers >Misleading data: The famous butterfly ballot used in Florida during the 2000 presidential election showed the of the arrangement of items on a page.
Cleaning “Dirty” Data >Judgment calls need to be made. >The best solution is to report everything so that other researchers can assess the trade-offs. >The best way to address the problem of dirty data is replication.