type of sampling : type one :Random/Probability sampling designs: 1-Simple rando
ID: 3365251 • Letter: T
Question
type of sampling :
type one :Random/Probability sampling designs:
1-Simple random sampling (SRS): Randomly select cases from population using snowball , computer or a table of generated numbers (with pr /without replacement).Randomly select cases from population using snowball , computer or a table of generated numbers (with pr /without replacement).
2-Stratified random :Separate population into two or more groups and randomly select sample from each group.
3-Cluster sampling:
}Used when the researcher was not able to identify the sample item, the sample is too large. E.g. Cities, District..etc.
}Could have one level, two levels or multilevel stages. Levels, schools, cities.:
type 2 Non-random/ non-probability sampling designs:
1-Quota sampling: convenient sampling targeting the sample that have specific characteristics. e.g, males.
2-Accidental sampling: the sample have no specific characteristics, people on the street .
3-Judgmental or purposive sampling: choosing the items that gives better or more information
4-Expert sampling: selecting participant who are expert in the field
5-Snowball sampling: start with group of sample and then they guide you to different group.
type 3 Mixed method sampling:
}Start with selecting the population to be included and then use the simple random sampling to select the item/people to be included in the study
}It also called Systematic sampling:
}E.g: Chose the Kth individual in the population.
exercise : according to these types of sample size identify the main and specific sample type in these two situations ?
Q1) A group of students want to check the awareness of people regarding the early diagnosis of breast cancer, they went to shopping center and start asking people using questioner and document their opinion.
Q2).A PhD student interested in assessing the impact of sleep duration during pregnancy and its impact on child birth weight, the student collect record of all pregnant women (50,000), and randomly select 1000 cases and interview them.
Explanation / Answer
Q1. A group of students want to check the awareness of people regarding the early diagnosis of breast cancer, they went to shopping center and start asking people using questioner and document their opinion.
This is an Example of Non-Random sampling and falls into the category of Accidental sampling method. Since the characteristics of the sample is not specific. Since we are doccumenting the opinion of the people in certain shopping center.
Q.2.This is an example of which comes in Type 3:Mixed method of sampling that is Systematic sampling. Since we select the population which we are going to study and then randomly selects the person (Sample) for the study.
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