calcium
The answer depends on the variability of the characteristic that is being measured.
Each member of the population has the same probability of being in the sample as any other. Equivalently, any set of members of the given sample size has the same probability of being selected as any other set.
The sample size will depend on a number of factors other than the populatoin.These include:the resources (time, money) available for data collection, cleaning and validation, input and storage, and analysis;the implications of getting the answer wrong;the variability of the characteristic that is being measured;whether or not a simple random sample is the best sampling scheme.
Sampling can be more accurate than a census as there is greater control of interviewers and less chances of mistakes being made as the data is collated
what is the type of sample in which each member of the sample set or group has an equal chance of being chosen
A sample size of one is sufficient to enable you to calculate a statistic.The sample size required for a "good" statistical estimate will depend on the variability of the characteristic being studied as well as the accuracy required in the result. A rare characteristic will require a large sample. A high degree of accuracy will also require a large sample.
The answer depends on the variability of the characteristic that is being measured.
In the context of a sample of size n out of a population of N, any sample of size n has the same probability of being selected. This is equivalent to the statement that any member of the population has the same probability of being included in the sample.
a control
a control
6 hours, 12 hours in the refirgerator.
Each member of the population has the same probability of being in the sample as any other. Equivalently, any set of members of the given sample size has the same probability of being selected as any other set.
to identify the blood type of the patient or the sample being tested
A urine sample usually lasts up to 7 days if frozen.
The control, or control group, goes through all the steps of an experiment, but does not contain the factor being tested, which is called the experimental variable or independent variable.
Using a a cotton swab, the sample cells are usually taken from inside the cheek of the subject being tested.
The factor being tested is the dependent variable.