Different sampling methods are discussed in the textbook. Pick one of the follow

Question

Different sampling methods are discussed in the textbook. Pick one of the following sample methods: Cluster Sampling Stratified Sampling Simple Random Sampling (a) Give a brief description of the method you selected. (b) Give an example of an experiment where you could apply this sampling method. Give the best level of measurement associated with the following outcome measurements (Nominal, Ordinal, Interval, or Ratio) (a) The year a college was first established (b) Bank ATM card PIN Create the frequency table for the following dataset. Use approximately 4 classes, and show how you determine your class width Create the corresponding frequency histogram for this data. Create the corresponding frequency polygon for this data

Explanation / Answer

Q1. a) Simple Random SAmpling: The technique of drawing a sample in such a way that each unit of the population has an equal and independent chance of being inckuded in the sample.

In this method, an equal probability of selection is assigned to each ubit of the population at the first draw. It also implies an equal probability of selecting any unit from the available units at subsequent draws

Random samples refers to that method of sample selection in which every item has an equal chance of being selected. But the random sample does not depend upon the method of selection only but also on the size and nature of the population.

Random sample can be obtained by any of the following methods:

a) Lottery System Method

b)Random numbers Method.

The main advantage of this technique is pesonal bias is completely eliminated. As such a simple random sample is more representative of the population as compared to the other sampling techniques.

b) Example:

A restaurant leaves a fishbowl on the counter for diners to drop their business cards. Once a month, a business card is pulled out to award one lucky diner a discounted dinner.

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