Determine the point estimate of the population mean and margin of error for the confidence interval


Determine the point estimate of the population mean and margin of error for the confidence interval with lower bound 20 and upper bound: 30 A) 20, E 10 B)--30, E = 5 C)--25, E = 10 D) 25, E 5

Answer

Solution : Given that, Lower bound = 20 and Upper bound = 30 bar x = (Lower bound + Upper bound ) / 2 = (20 + 30) / 2 = 50 / 2 = 25 bar x = 25 Marginn of error = E = Upper bound – bar x = 30 – 25 = 5 E = 5

Option D) is correct .

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