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If measurements are taken for two (or more) variable for a sample , then the correlation between the variables are the sample correlation. If the sample is representative then the sample correlation will be a good estimate of the true population correlation.
convenience sampling consists of two or more sample events.
A biased sample is a Statistical Sample in which the sample is biased or have more samples of the things that is being influenced.
The larger the sample of data collected leads to a more accurate conclusion.
a biased sample is chosen because it is liked more (looks prettier, more popular etc.) and a random one has no prefeerence hope i helped!!!! :p