Show:
Random Sampling
Observational and Experimental
Experimental Design
Randomized Block Design
Bias
100

What does SRS stand for?

What is simple random sample

100

What is the main difference between observational and experimental studies?

What is the imposition of a treatment

100

what is a subject?

what is human beings used within an experiment

100

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)

100

Name one type of bias

What is, undercoverage, nonresponse, voluntary response, response bias, and convenience sampling

200

What is the point of making a sample random?

what is to eliminate bias

200

which of the two gives cause and effect?

What is an experiment

200

What is the point of experimental design?

What is, the comparison of two separate groups

200

After blocks are created, what comes next?

What is Treatment

200

A student posts a poll on instagram what kind of bias is this?

What is voluntary response

300

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

300

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

300

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. 

300

What is the main benefit of using a randomized block design over an experimental design. 

What is, reduction of variability in the between blocks

300

how does bias occur when the first people seen were chosen?

What is convenience sampling

400

An SRS guarantees accurate results, TRUE or FALSE?

What is FALSE

400

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

400
Why is replication important?

What is, the reduction of chance variation

400

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

400

Why does convenience sampling create bias?

What is, loss of randomness since only the easiest subjects to test are chosen
500

Is selecting every 4th person in a sample of 50 people an SRS?

What is no, this is systematic sampling.

500

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.

500
A researcher gives all 10 subjects In his experiment a placebo (t2) and a treatment (t1) and knows what both the treatment is and the placebo. He randomly decides which subject gets (t1), and (t2), but has no clue who each subject is. Is this a double blind?
What is, No, since the researcher knows what both the placebo and the treatment were.
500

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?

what is, the reduction of the affect of soil quality.
500

In a school of 500 students 50 athletes are chosen as the sample, who is under-covered in this sample?

What is, non athletes