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Asked Oct 25, 2019

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Step 1

**Margin of error:**

The formula of margin of error for confidence interval is as follows:

Step 2

**a) Computation of margin of error for the confidence interval (68< µ<72):**

The confidence interval for the mean is given as 68<*µ*<72.

Here, the upper bound is 72 and the lower bound is 68.

The margin of error for the confidence interval (68<*µ<*72) is obtained as **2**, from the calculation given below:

Step 3

**b) Computation of margin of error for the confidence interval (0.623< p<0.626):**

The confidence interval for the proportion is given as 0.623<*p*<0.626.

Here, the upper bound is 0.626 and the lower bou...

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