统计题目，categorical data！（已解决）

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[backcolor=transparent !important]The table to the right displays information for [backcolor=rgba(0, 0, 0, 0) !important]5050[backcolor=transparent !important] [backcolor=transparent !important]widely held​stocks, on how their​ one-day change on a recent day compared with their previous​ 52-week change.

e) Among those companies reporting a positive change in their stock price over the recent​ day, what percentage also reported a positive change over the prior​year?

答案：55.655.6​%

​(Round to one decimal place as​ needed.)

​f) Among those companies reporting a negative change in their stock price over the recent​ day, what percentage also reported a positive change over the prior​year?

答案：56.556.5​%

​(Round to one decimal place as​ needed.)




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Over prior 52 weeks
	Positive Change	Negative Change

	Recent day	Positive Change	1515	1212
		Negative Change	1313	1010

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trippetta12

Among those companies reporting a positive change in their stock price over the recent​ day, what percentage also reported a positive change over the prior​year?
1515/(1515+1212)=0.5555556

Among those companies reporting a negative change in their stock price over the recent​ day, what percentage also reported a positive change over the prior​year?
1313/(1313+1010)=0.5652174

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疯狂小紫菜

trippetta12 发表于 2015-9-29 22:02
Among those companies reporting a positive change in their stock price over the recent​ day, what p ...

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