Direct access means going straight to the record you want,and random access means pick data randomly and then find that data which you required.
http://wiki.answers.com/Difference_between_direct_and_sequential_access#ixzz1685bfqda
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Random variables is a function that can produce outcomes with different probability and random variates is the particular outcome of a random variable.
Biased- (Not random) Unbiased-(Random) Example: (ubbiased) Woman takes random people to take a survey.
random sample is a big sample and convenience sample is small sample
Random sampling is picking a subject at random. Systematic sampling is using a pattern to pick subjects, I.e. picking every third person.
Random sampling is the sample group of subjects that are selected by chance, without bias. Random assignment is when each subject of the sample has an equal chance of being in either the experimental or control group of an experiment.