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A study of college students found the following information on the length of time (minutes) each texted on their cellphones during class. Find the 95%

A study of college students found the following information on the length of time (minutes) each texted on their cellphones during class. Find the 95% confidence interval of the true difference between the means for the data appearing below. What is the Lower bond value and upper bound value of the confidence interval?

males X1=21

S1=2.1

N1=50

Female X2=18

S2=3.2

N2=50

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