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 = (Lower bound + Upper bound ) / 2 = (20 + 30) / 2 = 50 / 2 = 25 = 25 Marginn of error = E = Upper bound – = 30 – 25 = 5 E = 5

Option D) is correct .