Confidence interval
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In a study of 10 insurance sale representatives from a certain large city, the average age group was 48.6 years and the standard deviation was 4.1 years. Assume the variable is normally distributed. Find the 95% confidence interval of the population mean age of all insurance sales representatives in the city.
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Solution Summary
The solution determines the confidence interval population mean age of all insurance sales representatives in the city.
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Summarize information given:
n= 10
Sample mean: 48.6 years
Sample STDEV.: 4.1 years
Since n<30 and population STEDEV is ...
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