I think there is a typo in the sample answer. The mean should be 1*1/4 + 5*3/4 = 1/4 + 15/14 = 16/4 = 4 (cents).werson9339 said:
Sampling is the process of selecting a subset of individuals or items from a larger population in order to gather information and make inferences about the entire population.
Sampling is important because it allows researchers to gather data and make conclusions about a large population without having to study every single individual or item in that population. This saves time and resources while still providing accurate results.
The variable of X in sampling refers to the characteristic or attribute being measured or observed in the sample. It represents the specific aspect of the population that the researcher is interested in studying.
There are several types of sampling methods, including simple random sampling, stratified sampling, systematic sampling, cluster sampling, and convenience sampling. Each method has its own advantages and disadvantages, and the choice of sampling method depends on the research question and resources available.
To ensure a representative sample, researchers must use a sampling method that allows every individual or item in the population to have an equal chance of being selected. This helps to avoid bias and ensures that the sample accurately represents the population. Additionally, the sample size should be large enough to provide reliable results.
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