Express the confidence interval (11.2%,29.2%)in the form of
ˆp±ME
___% ± ____%
Solution :
confidence interval (11.2%,29.2% )
confidence interval ( 0.112, 0.292)
Point estimate =
= (Lower confidence interval + Upper confidence interval ) / 2
Point estimate =
= (0.112 + 0.292) / 2
Point estimate =
= 0.202
Point estimate =
= 20.2%
Margin of error = E = Upper confidence interval -
Margin of error = E = 0.292 - 0.202
Margin of error = E = 0.090
Margin of error = E = 9%
Express the confidence interval in the form of
± ME
20.2% ± 9%
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