Quantitative Reasoning Chapter 5 & 6
You conduct a poll in which you randomly select 1000 registered voters from Texas and ask if they
approve of the job their governor is doing. The population for this study is -
all registered voters in the state of Texas
Results of the poll described in Question 1 would most likely suffer from bias if you chose the
participants from -
people who donated money to the governor's campaign
When we say that a sample is representative of the population, we mean that -
the results found for the sample are similar to those we would find for the entire
population
A poll concerning support for mass transit is conducted by interviewing people in 100 large cities,
with 25 people randomly selected to be interviewed in each of those cities. What type of sampling
was used? -
stratified sampling
Consider an experiment designed to test whether cash incentives improve school attendance. The
researcher chooses two groups of 100 high school students. She offers one group $10 for every week
of perfect attendance. She tells the other group that they are part of an experiment but does not
give them any incentive. The students who do not receive an incentive represent -
the control group
The experiment described in question 5 is -
not blinded at all
The purpose of a placebo is -
to prevent participants from knowing whether they belong to the treatment group or the
control group
An experiment is single-blind if -
the participants do not know whether they belong to the treatment or the control group
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