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A new energy drink is supposed to improve a person's time in the one mile run. The times, in seconds, of eight runners with and

A new energy drink is supposed to improve a person's time in the one mile run. The times, in seconds, of eight runners with and without the drink are given below:

Runner 123 456 78

x-time (before)267 283 270 265 261 247250 241

y-time (after)260277281 279260 242244 250

Find the 95 % confidence interval for mean of the differences, _d.

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