17. Students at a large University conducted a class project in which subjects w

Question

17. Students at a large University conducted a class project in which subjects were asked to memorize as many words as possible in 30 seconds from a list of ten words. There were four different lists of words: one list had short, concrete words (car, rock,... one list had long, concrete words (automobile, donkey,. one list had short, abstract words (sad, sweet, warm...) one list had long, abstract words (energetic, laughter, depressed..) ach list was presented to 13 di erent peo le chosen by convenience among students on the campus. w ich st a su ect received a deer nine andom ·The number o words successt memorized nan order) in 30 seconds was recorded. The data file WordMemory.txt contains the results. (a) Which type of study is this? (b) What is the explanatory variable? Is it categorical or quantitative? (c) What is the response variable? It is categorical or quantitative? (d) State the null and alternative hypotheses for using an ANOVA to determine whether the group means differ. Your hypotheses cannot just be statements about associations.

Explanation / Answer

This is an example of an observational study.

The explanatory variable here is the type of list received by the person, and it is a categorical variable.

The response variable is the number of words memorized in 30 seconds successfully. This is a quantitative variable.

The hypotheses are stated as:

H0: There is no difference in the mean number of words between the groups

Ha: The mean number of words between the groups differ

Hope this helps !

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