Stats: Simple Random Sampling
What is the acronym used for simple random sampling WITHOUT replacement?
SRS
What is the acronym used for simple random sampling WITH replacement?
SRSWR
What type of sampling is used?: To estimate the percentage of defects in a recent manufacturing batch, a quality control manager at IBM selects every 17th computer that comes off the assembly line starting with the eighth until she obtains a sample of 70 computers.
Systematic (every "kth")
What is the exception to the rule that systematic random sampling is easier/equally effective as simple random sampling?
Systematic random sampling is easier to execute than simple random sampling and usually provides comparable results. The exception is the presence of some kind of cyclical pattern in the listing of the members of the population.
In sampling, explain why obtaining a representative sample is important.
The sample must be representative in order to use inferential statistics to draw conclusions about the entire population.
What is a consequence of such low response rates?
The samples are not likely to be representative of their respective populations.
In an experimental drug design, which groups are considered "treatment" groups?
Those who get the drug AND those who get the placebo.`
a. In a designed experiment, what are the experimental units? b. If the experimental units are humans, what term is often used in place of experimental unit?
a: individuals/items being experimented on b: subjects
What is the collection of all possible outcomes for an experiment?
sample space
When you take simple random samplings of various populations and compare them.
stratified sampling
Which of these are possible dangers of nonresponse?
-Those who feel strongly about the subject are more likely to respond. -Those who do not feel strongly about the subject are less likely to respond.
