A psychologist examines long term retention of a learned task in a sample of n = 6 rats. At 90 days of age, rats are trained on a discrimination task. Their initial performance is recorded to serve as a baseline for subsequent comparisons. Then their performance is tested four more times at 6 months, 1 year, 1 1/2 years, and 2 years of age.  The researcher wants to see if performance changes over time.  What statistical procedure would you use to analyze this data and why? Z Score Comparing X to a Sample One Way Repeated Measures ANOVA Z Score Comparing a Sample to a Population Two Way Independent Measures ANOVA Single Sample t Pearson Product Moment Correlation Independent Measures t Chi Square Goodness of Fit Repeated Measures t One Way Independent Measures ANOVA

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Q: the

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.