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ʼn Steekproef van 80 brandbestryders lewer ʼn gemiddelde ouderdom van 45.2 jaar....
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ʼn Steekproef van 80 brandbestryders lewer ʼn gemiddelde ouderdom van 45.2 jaar. Aanvaar die populasiestandaardafwyking is 7.8 jaar. Die 95% vertrouensinterval vir die gemiddelde ouderdom van brandbestryders is / A sample of 80 fire fighters yields an average age of 45.2 years. Assume the population standard deviation is 7.8 years. The 95% confidence interval for the average age of fire fighters is
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