In a certain city, a researcher wishes to determine whether the average age of its citizen is really 61.2 years. A sample of 22 residents has an average of 59.8. The standard deviation of the sample is 1.5 years. At 1% level of significance, is the average age of the residents really 61.2 years? Assume that the variable is approximately normally distributed.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.