Point estimate refers to the mean drawn from a random, unrestricted sample. Interval estimate is the range where the population mean is likely to be.

A variable parameter is one which is not constant and generally falls in the DV, IV or MV categories for our purposes. An attribute parameter…

Systematic variance is the variation in measures due to known and unknown factors that cause the score to be biased in one direction or the…

In simple random sampling, each element has a known and equal chance of selection. Complex random sampling uses a statistical approach to element selection. Complex…

Convenience sampling is a non-probability unrestricted sampling method. Purposive sampling is another form of non-probability sampling that conforms to certain criteria; two forms of purposive…

a. Unrestricted sampling occurs when elements are selected individually and directly from the population, whereas, restricted sampling occurs when elements are chosen using a specific…

Standard deviation is the most common method used to show the spread by summarizing how far away from the average (mean) data values typically are….

A sample frame is the list of elements from which the sample is actually drawn, while the population is the entire group for which we…

Statistics refer to descriptors of relevant variables computed from sample data, while parameters refer to summary descriptors of variables of interest.

Experimental designs pose the ability to control all variables and thus provide the most powerful support available for a hypothesis of causation. Post facto designs…