Question

Express the confidence interval 30.4 % ± 5.1 % in interval form.

Answer #1

Solution :-

Given :

Point Estimate ( ) Margin of Error ( E )

30.4 % 5.1 %

0.304 0.051

Confidence Interval to be Expressed in interval form is,

- E < u < + E

0.304 - 0.051 < u < 0.304 + 0.051

0.253 < u < 0.355

**( 0.253 , 0.355 )**

Lower Confidence Interval = 0.253

Upper confidence Interval = 0.355

Express the confidence interval (84.6,268.8) in the form of
¯x±ME.
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of ¯x±ME.

Express the confidence interval 62%±5.6%62%±5.6% in interval
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Express the confidence interval ( 578.8 , 660 ) in the form of ¯
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2. Express the confidence interval 82.7% ± 6.9% in interval
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percents).
3. Assume that a sample is used to estimate a population
proportion p. Find the margin of error M.E. that
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confidence level of 99.8%.
M.E. =_____%

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% ± %

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