One that is not one of the explanatory variables in the study but is thought to
ID: 3119505 • Letter: O
Question
One that is not one of the explanatory variables in the study but is thought to affect the response variable Problems The head of the quality control department at a printing company would like to carry out an experiment to determine which of three different glues results in the greatest binding strength. though they are not of interest in the current investigation other factors thought to affect binding strength are the number of pages in the book and whether th is being bound s a paperback or a hard back. What is the response variable in this experiment? b. at explanatory variable will determine the experimental conditions? c. at two extraneous variables are mentioned in the problem description? d. Are there other extraneous variables that should be considered? The Pew Research center conducted a study of gender bias. The report "Men or women: who is the Better Leader? A Para- dox in Public Attitudes" (www.pewsocialtrends.org, august 28, 2008) describes how the study was conducted In the experiment, two separate random samples of more than 1000 registered voters were asked to read a profile sent to them online of a hypothetical candidate for U.S. Congress in their district. One random sample of 1161 respondents read a profile of Ann Clark, described as a lawyer, a churchgoer, a member of the local Chamber of Commerce, an environmentalist and a member of the same party as the survey respondent. They were then asked what they liked and didn't like about her, whether they considered her qualified and whether they were inclined to vote for her. There was no indication that this was a survey about gender or gender bias. A second random sample of 1139 registered voters was asked to read a profile of Andrew Clark, who-except for his gender-was identical in every way to Ann Clark. These respondents were then asked the same questions. a. What are the two treatments in this experiment? b. What are the response variables in this experiment? Red wine contains flavonol, an antioxidant thought to have beneficial health effects. But to have an effect, the antioxidan a poor source of bioavailable Flavonols in Men" (The journal o must be absorbed into the blood. The article "Red Wine Nutrition [2001]:745-748) describes a study to investigate three sources of dietary flavonol-red wine, yellow onions, an black tea-to determine the effect of source on absorption. The article included the following statement: e recruited subjects post and local newspapers. To ensure that subjects could tolerate the alcohol in th only men with a consumption of at least seven drinks per week to participate Throughout th llowed diet that was low in flavonoExplanation / Answer
1)
a) Binding Strength is the response variable
b) Glue type is the explanatory variable
c) Number of pages and whether the book is hardbound or paper bound are the extraneous variables
d) No extraneous variables are to be considered given the information available.
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