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The table below gives the average high temperatures in January and July for 12 random cities...

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Statistics

The table below gives the average high temperatures in Januaryand July for 12 random cities in a region with 192 192 cities.Write a 99 99​% confidence interval for the mean temperaturedifference between summer and winter in the region.

Mean High Temperatures ​( degrees °​F)

City A B C D E F G H I J K L

July 73 71 78 74 91 88 71 87 74 65 74 85

Jan. 35 37 40 37 56 53 39 45 46 43 19 36

The confidence interval is left parenthesis nothing commanothing right parenthesis . , . ​(Round to one decimal place as​needed.)

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