Question

A student study of the effects of caffeine asked volunteers to take a memory test 2 hours after drinking soda. Some drank caffeine-free, some drank regular, and others drank a mixture of the two. The 5-number summaries for each group's scores (number of items recalled correctly) on the memory test are shown below. Complete parts a)-d). Min 17 16 01 19 19 16 Median 20 21 03 26 25 23 15 No Caffeine Low Caffeine 15 High Caffeine 15 24 a) Describe the W's for these data. Who What b) Name the variables and classify each as categorical or quantitative. The two variables are the c) Create parallel boxplots to display these results as best you can with this information. Create parallel boxplots, where N represents the group with no caffeine, L the group with low caffeine, and H the group with high caffeine. Choose the correct graph below. O A. and the ? , which are and variables respectively d) Write a few sentences comparing the performances of the three groups. V.The medians for these two groups were with slightly more variation in ? The The participants scored about the same with other two groups on all measures of the 5-number summary. generally scored lower than the Click to select your answer.

Answer 1

a) Describe the W's

Who: Volunteers (It refers to WHO are the subjects)

What: Memory Test ( It refers to WHAT is the experiment or treatment etc.)

Where: Not specified

When: Not specified

How: Students asked volunteers to take a memory test 2 hours after drinking soda. Some drank caffeine-free soda, some drank regular soda (with caffeine) and others drank a mixture of the two (getting a half dose of caffeine).

Why: To determine if caffeine has an impact on memory

B) Name the variables and classify each as categorical or quantitative

a) Memory test score: Quantitative

b) Level of caffeine in the drink(No, Low, and High): Categorical

C) Create parallel boxplots to display these results the best you can with this information

Using min, max, Q1, Q3 and median have plotted box plots of three categories in EXCEL

Which resembles the option C of the question.

d) The participants scored about the same with No and Low caffeine. The median for these two groups were close with, slightly more variation in High Caffeine The High Caffeine generally scored lower than the other two groups on all measures of the 5-number summary.

The high caffeine has the largest range of scores and consistently remembered fewer items as compared to No and low caffeine group. The no and low groups had similar data with the no caffeine group being more consistent with the number of items remembered. The low caffeine groups had a slightly higher range of scores than the no caffeine group but the median values were the same.