In which type of sampling method is the probability of selection of every case is known but unequal between strata?

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In Disproportionate Stratified sampling, the probability of selection is known but unequal between strata. This method is used when the strata have different sizes or variances, and the researcher wants to oversample or undersample specific strata to obtain a more representative sample. Therefore, it is the best choice for this scenario.

In Which Type of Sampling Method Is the Probability of Selection