A group conducted a randomized experiment to see if hormone therapy was helpful for​ post-menopausal women. The women were randomly assigned to receive a hormone or a placebo. After 5​ years, 108 of the 8528 on the hormone therapy developed cancer and 84 of the 8206 in the placebo group developed cancer. Is this a significant​ difference?   Find the Test statistic

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Q: Please see below. Thank you!

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Q: Find the 90th percentile.

A: It is very useful in statistics . It is highly used nowadays .