A researcher wants to take a study sample consisting of 30 banks operating in all the governorates of Bahrain, knowing that the number of banks in Bahrain is 300 and the number of banks in each governorate is as follows:

Capital Governorate 180 banks

Muharraq Governorate 50 banks

Northern Governorate 40 banks

Southern Governorate 30 banks.

Help the researcher to apply the steps of selecting a research sample with an explanation of each of these steps. The answer must include the appropriate type of sample and its distribution to the study population