A simple random sample of 12 rods was taken from a population of 1000 metal rods

Question

A simple random sample of 12 rods was taken from a population of 1000 metal rods produced on an assembly line. The mean of the population is known to be 20.0 cm. The sample had a mean of 19.8 cm
Is this an example of biased sampling? Explain.

Was this a representative sample? Explain. A simple random sample of 12 rods was taken from a population of 1000 metal rods produced on an assembly line. The mean of the population is known to be 20.0 cm. The sample had a mean of 19.8 cm
Is this an example of biased sampling? Explain.

Was this a representative sample? Explain.
Is this an example of biased sampling? Explain.

Was this a representative sample? Explain.

Explanation / Answer

This is not biased sampling example because the mean of the sample is very near to the mean of the population. Also from the mean of sample values, it is evident that sample does not inclued outliers.

This sample can be considered as representative sample because sample mean closely represent the population mean.

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