- A researcher would like to determine the average reading ability for third grade students in the school.
- A sample of n = 25 students is selected and each student takes a standardized reading achievement test.
- The average score for the sample is M (sample mean) =72 with SS (variance) = 2400.
- Use the sample results to construct a 99% confidence interval for the population mean.
**With 99% confidence,
we estimate that the population mean is between 66.408 and 77.594.
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