Random Sampling
What does SRS stand for?
What is simple random sample
What is the main difference between observational and experimental studies?
What is the imposition of a treatment
what is a subject?
what is human beings used within an experiment
What is the reasoning behind forming separate groups before the assignment of treatments?
What is, to reduce variability in the groups differences (this is blocking)
Name one type of bias
What is, undercoverage, nonresponse, voluntary response, response bias, and convenience sampling
What is the point of making a sample random?
what is to eliminate bias
which of the two gives cause and effect?
What is an experiment
What is the point of experimental design?
What is, the comparison of two separate groups
After blocks are created, what comes next?
What is Treatment
A student posts a poll on instagram what kind of bias is this?
What is voluntary response
If there are 10 groups of 10, and an SRS of 20 people are selected, how many people from each group are expected to be selected from each group
What is 2 from each group
A group of subjects has been selected and are given both a treatment and a placebo and the results are then recorded, is this an experiment or an observational study?
What is, an experiment
What is a double blind, and why is it useful?
What is, the treatment of a subject being unknown to the subject but also the researcher. It is useful since it eliminates bias from all parities.
What is the main benefit of using a randomized block design over an experimental design.
What is, reduction of variability in the between blocks
how does bias occur when the first people seen were chosen?
What is convenience sampling
An SRS guarantees accurate results, TRUE or FALSE?
What is FALSE
both a group of subjects who drink alcohol daily, and a group who doesn't drink alcohol at all have their liver health examined. Is this a observational study or an experiment?
What is, an observational study
What is, the reduction of chance variation
A researcher is creating a block design for athletes of all different sports seeing how caffeine affects their performance. The caffeine is assigned based on sport. What is the point of blocking based on sport?
What is, the caffeines affect may be dependent on sport and doing this reduces variation
Why does convenience sampling create bias?
Is selecting every 4th person in a sample of 50 people an SRS?
What is no, this is systematic sampling.
One singular driver places coordinates into both apple and Google Maps to the same exact place, and got a difference in both the estimated times of arrival. Is this an observational study or an experiment?
What is, an observational study.
A farm is testing fertilizers (3) in Blocks of soil quality, poor, medium, great. Fertilizer was then randomly assigned to each group. Why is using blocks of soil quality important?
In a school of 500 students 50 athletes are chosen as the sample, who is under-covered in this sample?
What is, non athletes