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I need help, assuming that both populations are normally distributed, construct a 95% confidence interval about n1 - n2. (n1 represents the mean of

I need help, assuming that both populations are normally​ distributed, construct a 95​% confidence interval about n1 - n2. ​(n1 represents the mean of the experimental group and n2 represents the mean of the control​ group.) I keep having issues with rounding. I am not sure how I keep coming up a digit or so off from the correct answer.


Experimental Control

n 21 18

x 48.6 43.5

s 5.8 12.1

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1 comment
  • t=-2.0262
    • oflores31
    • Aug 02, 2018 at 7:42am

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