"Express the confidence interval 20.2%±9% in interval form. Express the answer in decimal format (do not...

Question

Question

"Express the confidence interval 20.2%±9% in interval form.
Express the answer in decimal format (do not enter as percents). "

For my answer I got (.2011, .2029), however, my online homework says this answer is incorrect. I cannot figure out what I'm doing wrong.

Answer 1

Answer #1

Confidence interval is ((20.2-9)/100), (20.2+9)/100)
ie (11.2/100, 29.2/100)
(.112, .292)

Answer 2

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