Sample Definitions
A simple random sample is done by...
What is ensuring everyone in the population has an equal chance of being selected?
What is stratified random sampling
Treatments are...
What is what is done (or not) to experimental units?
A control group is...
What is a group that doesn't recieve treatment to keep other variables consistent?
Undercoverage is...
What is when some people are less likely to be chosen?
A convenience sample is done by...
What is selecting participants based on their ease of access, not on a random process?
Numbered all students at OHS. Used a random number generator to obtain 1/3 of the students. These students were allowed to use self generated notes on all their tests for a semester. Obtained another 1/3 of the students at random and these were allowed to use teacher provided notes on all their tests for a semester. And remaining 1/3 were not allowed to use notes on their tests for a semester. Average test scores for the semester were recorded for each student and overall average test scores within each of the three groups was compared. Name the experimental design used.
What is completely randomized design.
The difference between an observational study and an experiment is...
What is no treatment imposed for observational study while treatment imposed for experiments?
The 3 types of experimental design are....
What is 1) completely randomized design, 2) completely randomized block design, 3) matched pairs design
Non-Response Bias is...
What is people can't be reached/refuse to answer so they aren't surveyed?
A cluster random sample is done by...
What is dividing the population into groups and randomly selecting some groups as the sample?
Numbered all students at OHS. Used a random number generator to obtain 1/3 of the students. These students were allowed to use self generated notes on all their tests for a semester. Obtained another 1/3 of the students at random and these were allowed to use teacher provided notes on all their tests for a semester. And remaining 1/3 were not allowed to use notes on their tests for a semester. Average test scores for the semester were recorded for each student and overall average test scores within each of the three groups was compared. How many factors in the study? With how many levels? Was a control group used?
What is..
1factor - notes
given at 3 levels (self, teacher, none)
Yes - the no group acted as a control
Experimental units are...
What is what/who is getting treatments imposed?
Single blinding is...
What happens when subjects or experimenters don't know about their treatment assignment?
Response Bias is...
What is problems in the data gathering method or process?
A stratified random sample is done by...
What is spliting the population into groups (strata) then choosing SRS from each strata?
all classrooms at OHS were numberered an 10 were chosen at random. All students within those 10 chosen classrooms were asked to fill out a survey about quality of food provided at OHS. This type of sampling is known as....
What is Cluster Sampling.
A confounding variable is...
What is when an unaccounted for outside variable can affect the results of the experiment?
Double blinding is...
What is when subjects and experimenters don't know about their treatment assignment?
A matched pairs design is...
What is when subjects are paired and then randomly assigned to a treatment?
A systematic random sample is done by...
What is choosing a random starting point and then using equal intervals?
Mrs. Stetter randomly selected 4 students from each of her classes and interviewed them on whether or not they liked her teaching style. Is this an SRS? And what type of bias might this data collection process result in?
What is NO! This is a stratified random sample, which is NOT an SRS because not all groups of 24 students could be selected....it ensured some from each. AND this type of BIAS likely will result in response bias due to the interview style of questioning.
Replication is...
What is when more than 1 person is in each treatment?
The placebo effect is...
What is when the false treatment works and gives the same result as the actual treatment?
A randomized block design is...