What is non probability sampling and explain the types of the sample

Explain how cluster sampling is different from stratified sampling

Sample variance:  sample standard deviation:

Explain how the choice of a survey mode affects the choice of a sampling frame?

Four sampling strategies have been proposed to help a bank determine whether customers favour opening on Saturdays versus keeping branches open longer during the week. For each, discuss what kind of sampling strategy is involved and what (if any) biases might result. (a) Sponsor a commercial during a TV program, asking people to dial one of two phone numbers to indicate which option they prefer. (b) Hold a meeting at each branch and tally the opinions expressed by those who attend the meetings. (c) Randomly select one day at each branch and contact every customer who visits the branch that day. (d) Go through the bank’s customer records, selecting every 100th customer. Hire a survey research company to interview the people chosen.

What is the difference between the population and the sampling frame?

Why is it important to always pre-test a questionnaire?

In a study, the sample is chosen by grouping people by their city of residence and selecting 10 residents from each city.What is the sampling method? Simple Random Sampling Systematic Sampling Stratified Sampling Cluster Sampling Convenience Sampling

If every 13th item is systematically sampled to produce a sample size of 72 items, approximately how large is the population?