Data set: Memory A
Michael Eysenck tested 100 subjects (50 people between the ages of 55 and 65, 50 younger people) to determine if there was a relationship between age and memory.10 Each subject was shown 27 words and asked to recall as many \ of those words as possible. He also tested whether five different techniques impacted memory. Each subject was given one of five types of instructions:
Counting: count the number of letters in each word
Rhyming: think of a word that rhymes with each word
Adjective: think of an adjective to describe each word
Imagery: create an image of each word
Intentional: remember as many words as possible
The subjects in the first four groups were not aware that they would later be asked to recall each word. The data set called Age provides the number of words that each subject properly wrote down after being asked to recall the list.
a. Create appropriate graphs/charts to check for equal variances and normality. Does it appear that it is appropriate to use ANOVA to analyze these data? Show your work and give concise but appropriate explanations.
b. Take the square root of the response and conduct an ANOVA on the transformed data to analyze all main effects and two-way interactions. Create appropriate graphs that describe the data. Clearly and concisely interpret the results.