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WorksheetsUnit 4 Review
Total questions: 37
Worksheet time: 31mins
Which of the following is a true statement about randomized experiments? (Pick the best answer)
It is used to insure against bias.
b. It causes subjects to be blind of whether they know or not what treatment they are having.
It eliminates the effects of all explanatory variables.
d. It ensures that a group receives a placebo for experimentation.
A _________________ would allow the experimenter to determine if either of the new medicine is more effective than the current medicine.
Control Group
Sampling Frame
Bias Response
Treatment
A randomized experiment...
Is always ethical
Has a cause-effect relationship
Has a bogus relationship
A news show asks callers to call an 800 number and express their views on a controversial issue. What type of bias is this?
Volunteer
No bias detected
Convenience
A civilian goes to a random dog park and asks pet owners which animal they would prefer as a pet.
This is bias because the civilian is at a park where people will most likely be owning dogs.
This is not bias because the civilian is randomly choosing pet owners.
This is bias because the question is misleading.
This is not bias because the civilian has a small margin or error.
If the experiment is conducted double-blind, then...
The participants do not know whether they are taking the drug or a placebo.
Neither the participants nor the experimenter know which volunteers are taking the drug and which the placebo
The participants are blindfolded when they take the drug or placebo.
A survey is mailed to 1000 voters randomly selected from a county's registered voters. Only 235 are returned, and of these 180 respond "yes." The biggest concern about making an inference from this survey is
Sampling bias
Nonresponse bias
Response bias
How the random selection of voters was carried out
100 students are randomly selected from each of the freshman, sophomore, junior, and senior classes to complete the survey. This plan is an example of which type of sampling?
Convenience
Simple random
Stratified
Cluster
50 classrooms are randomly selected from the state of Arizona to complete the survey. Every student in these classes were given a survey. This plan is an example of which type of sampling?
Convenience
Simple random
Stratified
Cluster
10 of the men and 10 of the women were chosen at random to receive the new drug. The remaining 10 men and 10 women received a placebo. The change in blood pressure was measured for each subject. The design of this experiment is
Completely Randomized with one factor, drug
Randomized Block, blocked by drug
Randomized Block, blocked by gender
Completely Randomized with one factor, gender
When an observed effect is so large that it would rarely occur just by chance, it is known to be…
An outlier.
Statistically significant
A placebo effect
A control group
Which of the following defines placebo effect?
A treatment that tastes good and feels good to experimental units.
A treatment that is given to all experimental units.
A treatment that has no therapeutic value but looks and tastes like the other treatment.
A treatment that is given to both groups of the experimental study.
A survey of 2000 American adults 18 years and older was conducted. The respondents were asked, "Do you have a great deal of concern regarding global warming (the greenhouse effect)?" Of the 2000 adults surveyed, 50% said they worried about global warming a great deal. What is the POPULATION?
2000 Americans
American adults
18 year olds
Americans who are worried about global warming
A survey of 2000 American adults 18 years and older was conducted. The respondents were asked, "Do you have a great deal of concern regarding global warming (the greenhouse effect)?" Of the 2000 adults surveyed, 50% said they worried about global warming a great deal. What is the SAMPLE?
2000 Americans
American adults
18 year olds
Americans who are worried about global warming
A survey of 2000 American adults 18 years and older was conducted. The respondents were asked, "Do you have a great deal of concern regarding global warming (the greenhouse effect)?" Of the 2000 adults surveyed, 50% said they worried about global warming a great deal. What is the MARGIN OR ERROR?
14%
7%
3%
2%
There are 1700 students at a school campus. What is the number of the SECOND student to be selected from the random numbers below: 16348 76938 90169 51392 55887 71015 09209 79157
1634
769
920
1695
There are 1700 students at a school campus. What is the number of the FIRST student to be selected from the random numbers below: 16348 76938 90169 51392 55887 71015 09209 79157
1634
769
920
1695
Entire collection of people, animals, plants, or objects from which we collect data
sample
sample size
representative sample
population
A subset of individuals that had an equal probability of being chosen
sample
bias
representative sample
random sample
Choosing individuals from the population who are easy to reach
convenience sampling
voluntary sampling
stratified random
simple random
A sample that consists of people who choose themselves by responding to a general invitation.
voluntary sample
simple random
cluster random sampling
convenience random sampling
When a sample does not accurately represent the population it is a:
A. Unbiased sample
B. Biased sample
Biased questions lead people to answer a particular way.
A. True
B. False
To investigate whether standing up while studying affects performance in an algebra class, a teacher assigns half of the 30 students in his class to stand up while studying and assigns the other half to not stand up while studying. Which of the following best describes this plan?
This is an observational study
This is an experiment
This is a stratified random sample
This is a cluster sample
To determine whether a review session will improve his students tests scores, an Algebra 2 instructor divides his class into 2 groups. He then requires one group to attend a study session and compares the test results of each group. Is this an example of an experimental study or observational study?
Experimental
Observational
A researcher wants to know the average amount of bamboo consumed by the new pandas at the Atlanta zoo. She records the amount of bamboo consumed every for 3 months. Is this an example of an experimental study or observational study.
experimental study
observational study
A study in which the researcher simply watches the subjects or asks questions but does not impose any sort of treatment.
observational
experimental
What kind of study is this?
A researcher wants to determine if there is a relationship between attending an ACT prep class and scores achieved on the ACT exam. A group of students who took the ACT are surveyed. The scores from the students who took the prep class are compared with the scores of those who did not take the prep class.
observational
experimental
What kind of study is this?
A researcher wants to determine if the color of a basketball influences the number of times a shooter makes a basket. A random group of students is chosen and asked to shoot a series of baskets using a normal regulation basketball. The data is recorded. The same group is then given a blue colored basketball and the same number of shots is repeated. The data is again recorded and analyzed.
observational
experimental
There are 1700 students at a school campus. What is the number of the SECOND student to be selected from the random numbers below: 16348 76938 90169 51392 55887 71015 09209 79157
1634
8769
920
1695
