http://news.brown.edu/articles/2015/05/rape Questions about above article: A. Wh
ID: 3176811 • Letter: H
Question
http://news.brown.edu/articles/2015/05/rape
Questions about above article:
A. What is the explanatory variable?
What is the response variable?
B. Is the sample random?
C. What type of sample is it? (Simple, Stratified,
Voluntary, etc)
D. Is there bias?
What are possible lurking variables?
E. Is there undercoverage? Nonresponse?
Response bias? Poorly worded questions?
(If not listed discuss
the possibility these
would have happened)
F. Summary explaining why
the claim could be
statistically acceptable
or if it should be rejected.
Explanation / Answer
A. Here dependent variable is: Count of Incapacitated rape (IR) and forcible rape (FR). Explanatory variable is time period.
B. Yes, we can say that the sample is random as the female students answered the standardized survey questions when they arrived on campus, assuming there was no ordering here.
C. The sample is stratified as the sample was demographically representative of the school’s overall freshman class.
D. There can be bias involved as it is based on the survey question and there is no way to verify their claims. There can be some lurking variable which can effect the interpretation of relationships between varaibles.
E. There is no undercoverage as the sample was demographically representative of the school’s overall freshman class, so every demography was well represented. There is no poorly worded question as the question was very clear. The study defined rape as “vaginal, oral, or anal penetration using threats of violence or use of physical force, or using the tactic of victim incapacitation.”
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