Practice question
All Year 3 students at Hangzhou No. 14 High School must take this math course.
What is AP Statistics?
This is the group of individuals that we want information about in a survey.
What is a population?
This type of sampling occurs when individuals respond to an open invitation.
What is voluntary response sampling?
This type of process does not assign any treatments to the population.
What is an observational study?
This phenomena is often the reason why we need a "fake treatment" and a real treatment when applying them to people.
What is the placebo effect?
This sampling method ensures that every sample has the same probability of being chosen.
What is a simple random sample?
This is an issue that causes surveys to underestimate or overestimate the population parameter.
This type of experiment is useful if you don't want the subjects nor the people applying treatments to know which treatment is being applied.
What is a double blind experiment?
The situation below uses this kind of sampling:
Laying fiber-optic cable is expensive. Cable companies want to make sure that if they extend their lines to less dense suburban or rural areas, there will be sufficient demand so the work will be cost-effective. They decide to conduct a survey to determine the proportion of households in a rural subdivision that would buy the service. They select a simple random sample of 5 blocks in the subdivision and survey each family that lives on one of those blocks.
What is cluster sampling?
This process samples every member of a population.
What is a census?
This type of sampling chooses individuals that are particularly easy to survey.
What is convenience sampling?
This is an experimental design in which the population is separated into groups that have similar traits within them.
What is randomized block design?
The situation below uses this kind of sampling:
How much sleep do high school students get on a typical school night? A counselor designed a survey to find out. To make data collection easier, the counselor surveyed the first 100 students to arrive at school on a particular morning. These students reported an average of 7.2 hours of sleep on the previous night.
What is a convenience sample?
Use this type of sample for groups that are in close proximity to each other.
What is cluster sampling?
This sampling issue occurs when some members of the population are less likely to be chosen, or are not chosen at all (especially if their responses are different from actual respondents).
What is undercoverage?
This principle ensures that researches can distinguish between chance variation and statistically significant changes between treatment groups.
What is replication?
This kind of sampling issue is present in the situation below...
A local news agency conducted a survey about unemployment by randomly dialing phone numbers during the work day until it gathered responses from 1000 adults in its state. In the survey, 19% of those who responded said they were not currently employed. In reality, only 6% of the adults in the state were not currently employed at the time of the survey.
What is nonresponse bias?
This sample is used when there are known differences between two or more subsets of the population.
What is stratified random sampling?
This happens when people can't be contacted or refuse to answer.
What is nonresponse?
This special type of experimental design uses blocks of size 2.
What is matched pairs design?
This experimental design issue is present in the study below:
Is fish good for the gut? Researchers tracked 22,000 male physicians for 22 years. Those who reported eating seafood of any kind at least 5 times per week had a 40% lower risk of colon cancer than those who said they ate seafood less than once a week.
What is confounding?