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ESTIMATION OF PARAMETERS: CONFIDENCE INTERVAL In an interview held among 18 randomly selected elementary teachers at a certain school, the mean salary was found to

ESTIMATION OF PARAMETERS: CONFIDENCE INTERVAL

In an interview held among 18 randomly selected elementary teachers at a certain school, the mean salary was found to be Php21 000 with a standard deviation of Php3 000. Use 95% confidence to estimate the population mean where the sample came from.

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