# Express the Confidence Interval in the form of xbar +-E

Express the Confidence Interval in the form of xbar +-E

Given Information:

Z interval: (291.67, 543.11)

xbar = 417.39

n=98

Choose correct confidence interval:

a) 417.39 +- 291.67

b) 417.39+-125.72

Why?

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#### Solution Preview

Please see the attached Word document for solution and explanation.

Solution:

Recall the formula for finding a confidence interval:

You can see that ...

#### Solution Summary

In this solution, we are given a confidence interval expressed as z-scores and must convert it to the form xbar +-E. Calculation details and explanation provided.

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