Experiment cannot be predicted in advance is RANDOM EXPERIMENT......
set of all possible outcomes.
outcome that can be predicted with certainity.
when an experiment performed repeatedly- called trial.
Ex. If a coin is tossed,we can't say,whetefr head or tail will appear .so it is a Random Experiment.
Sample Space:-- Possible outcomes of a random experiment..
set of all posssible outcomes..
denoted by--- "S".
and no. of elements is denoted by n(s).
ex. In throwing a dice ,the number that appears at top is any one of 1,2,3,4,5,6 ,So here:
S= 1,2,3,4,5,6 n(s) --- 6
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There are circumstances when it is important and others when it is not. If, for example, you wanted a sample of all schools in the country, it would make more sense to go for cluster sampling. A lot of market research work will require quota sampling. So the supremacy of a random sample is a myth.
A random distribution is a random sample set displayed in the form of a bell curve. See random sample set.
to select a random sample you pick them at random
The sample size determines the accuracy of results in an experiment
a random friend put