Question

When collecting the data, you choose a Saturday morning and send a person to each of...

When collecting the data, you choose a Saturday morning and send a person to each of the five stores in the city. You have them use a die to choose the people to interview by rolling the die each time a person leaves the store and only interviewing a person if the roll is a 1. Will this method produce a random sample that is representative of the population?





Math   Statistics-And-Probability   
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Answer #1

For the time being let us assume that the enumerator visited the store and tossing a die to decide whether to include the person or not. Here each customer who is leaving the store has a 1 in 6 chances of being interviewed further. This process will generate a random sample since each individual has a probability to getting involved.

The only catch here is the day ie Saturday. It is not known why a Saturday is choosen. This might pose a big issue if a proper reasoning is not given. Since choosing only a Saturday gets into a judgemental issue and this could make the sample as judement sample. It could be possible that on Saturday, there may be very few customers or many customers.

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