(5 points) The mayor of a remote town wanted to investigate the effectiveness of advertisements broadcast through the local television channel. More specifically, the mayor wanted to investigate the effect of the length and the repetition of the television advertisements broadcast on the town's residents desire to buy a locally manufactured James & Maria brand radio. Eighty residents viewed a 60-minute television program that showed at least one commercial for James & Maria radios during advertisement breaks. Some residents saw a 15-second commercial, some saw a 30-second commercial, others a 60-second commercial. The same commercial was shown two, four, or six times during the program. After the viewing, each resident was asked to rate their craving for a James & Maria radio from the set {"Don't want to buy", "Neutral", "Want to buy","Need to buy"}.

Question

Part I
What kind of study is this?

A. An observational study because there was no control group.
B. An experiment because the study investigator controlled the amount of exposure to advertisements the participating residents received.
C. An experiment because the study investigator compared the degree of craving between different amounts of exposure to advertisements in the study.
D. An observational study because the study investigator observed the residents' ratings on their craving for a James & Maria radio.
E. None of the above
Part II
What is/are the response variable(s) in the study?

A. Two, four, or six commercials during the 60-minute television program.
B. The 60-minute television program.
C. The 80 residents.
D. Craving for a James & Maria radio.
E. The length and repetition of the TV advertisements
Part III
If the investigator would like to compare the distributions of the response variable across different lengths and frequencies of commercials, which of the following displays is appropriate?

A. Histogram
B. Scatter plot
C. Stem-and-leaf plot
D. Side-by-side boxplots
E. Contingency table
Part IV
What is/are the factor(s) in the study?

A. Craving for a James & Maria radio
B. The length of the television program
C. Two, four, or six commercials during the 60-minute television program
D. 5-second, 30-second and 60-second commercials.
E. Length and frequency of the commercial.
F. The number of residents.
Part V
(c) How many treatments are there in the study? Enter your answer as a number (e.g. 1), not as text.
ANSWER
3

Answer 1

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Disagree with V(c).