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WorksheetsUnit 3 Review: Surveys & Experiments
Total questions: 28
Worksheet time: 7hrs 46mins
Dylan wants to know how the students at his school rate the cafeteria. He surveyed his school's basketball team to rate the school cafeteria. Is this a biased sample of the school's population?
Yes, because it is a convenience survey
No, the basketball team is representative of the population
Yes, because it's voluntary survey
No, because it is a SRS
Is this study OBSERVATIONAL or EXPERIMENTAL?
One day, Ms. Senneseth wants to estimate how many students did their HW. She draws from her card deck and gets a "1" and a "5". She then asks all the students at Table 1 and all the students at Table 5. This sampling technique is called?
Simple Random Sample
Stratified
Systematic
Cluster
What is the response variable in this experiment?
"Does eating breakfast improve test score?"
eating breakfast or not
the grade you got on the test
what time you get up in the morning
what you eat for breakfast
What is the explanatory variable in this experiment?
"Which type of metal, copper or aluminum, conducts heat faster?"
size of metal
types of metal
time it takes to heat up
shape of the metal
Identify the sampling technique: Interview every 10th student who enters the school in the morning.
simple random
voluntary response
systematic
convenience
Identify the sampling method: Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected.
systematic
simple random sample
convenience
cluster
An independent research company wants to go door to door to survey people in the town of Fort Mill. The company decides to number all neighborhoods within the town limit, randomly chooses 5 neighborhoods, and then surveys all households in those neighborhoods.
This is an example of:
Simple Random Sample
Stratified Random Sample
Cluster Random Sample
Systematic Random Sampling
A ___ is a large group that includes everything of interest being studied.
Sample
Simple random sample
Population
individual
Identify the sampling method: The high school principal randomly selects 2 students from each grade to serve on a student advisory board.
Convenience
Systematic
Stratified
Simple Random
What is the difference between an observational study and an experiment?
Observational studies compare data.
Experiments impose treatment on the subjects.
Experiments involve having multiple treatments.
Observational studies have subjects and treatments.
A report in a medical journal notes that the risk of developing Alzheimer's disease among subjects who regularly opted to take Ibuprofen was about half the risk among those who did not. Is this good evidence that Ibuprofen is effective in preventing Alzheimer's?
Yes, because the study was a randomized, comparative experiment
No, because the effect of Ibuprofen is confounded with the placebo effect
No, because this is an observational study. An experiment would be needed to confirm (or not confirm) the observed effect.
Yes, because a 50% reduction can't happen just by chance
A recent survey found that out of 400 random American adults, 89% pay their bills on time. The margin of error in this survey was 2%. What is the interval of values in which the true proportion is likely found?
89% - 91%
87% - 89%
87% - 91%
388 - 402
A newspaper asks its readers to call in and answer the following question, "Are young adults unprepared for college?" What type of sample is this?
Convenience Sample
Random Sample
Voluntary Response Sample
Call in sample
A recent survey found that 77% of high schoolers use their phones more than 4 hours a day on average. Below shows the results of 100 simulations using this data. What is the margin of error for this situation?
4.056%
8.112%
2.028%
77%
Zoe completes a report by asking 70 students across CHRS. She found that 18% of CRHS students do not wash their hands after using the bathroom. What is the population of her survey?
the students who use the bathroom
all CRHS students
18% of CRHS students
the 70 CRHS students surveyed
Zoe completes a report by asking 70 students across CRHS. She found that 18% of CRHS students do not wash their hands after using the bathroom. What is the sample size?
18
100
70
all CRHS students
In a completely randomized experimental design...
A control group must be used as a baseline for comparing the effects of the other treatments.
Similar subjects are grouped into blocks.
A placebo treatment is always used.
All experimental units are immediately randomly assigned to treatment groups.
A control group in an experiment is...
a group of similar subjects blocked together at the beginning of an experiment
a group that does not receive treatment (or receives a placebo treatment) to provide baseline data for comparison
Define statistically significant:
An observed effect that would rarely occur by random chance (under 5% chance)
An observed effect that would often occur by random chance (over 5% chance)
What is randomized block design?
Experimental units are randomly assigned to treatment groups at the beginning of the experiment.
experimental units are separated into blocks of similar subjects and then treatments are carried out separately within each block.
Describe the placebo effect.
Subjects are unaware of which treatment they are receiving
Subjects have a favorable response to a "fake" treatment
Subjects AND researchers are unaware of which treatment is assigned to which subject.
Can changing diet reduce high blood pressure? Vegetarian and low-salt diets are both promising. Men with high blood pressure are assigned at random to four diets: 1) normal diet with unrestricted salt, 2) vegetarian with unrestricted salt, 3) normal with restricted salt, 4) vegetarian with restricted salt. This experiment has
one factor: the type of diet
two factors: normal/vegetarian diet and unrestricted/restricted salt
three factors: men, high blood pressure, and type of diet
four factors: the types of diets being compared
I want a representative sample of likely voters. I use a telephone directory to randomly select and call 200 people. What is the most apparent type of bias?
Undercoverage
Nonresponse
Response
Voluntary Response
An in-person survey in which respondents were asked if they voted in the most recent election is likely to suffer from _________ bias if the respondents feel embarrassed about not voting.
response
undercoverage
non response
