AtomicReaper
  • AtomicReaper
The difference of two sample means is 22, and the standard deviation of the difference of the sample means is 10. The difference of the means of the two populations at a 95% confidence interval is ±________________.
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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AtomicReaper
  • AtomicReaper
@xMissAlyCatx, can you help?
xMissAlyCatx
  • xMissAlyCatx
Oh my goodness, I've not done standard deviation in a while. What do you think it is?
AtomicReaper
  • AtomicReaper
I have no earthly Idea, to be dead honest.

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xMissAlyCatx
  • xMissAlyCatx
well first of all we do know that we have two averages (means) of which when subtracted equal 22, and when you use 22 to plug it in to the standard deviation formula you'd get 10. You're at 95 % so let's see what we can do here.. I think you'll need to plug in some numbers but I'm unsure.
xMissAlyCatx
  • xMissAlyCatx
I'm going to try to use this as a guide and hopefully it might help me. XD
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AtomicReaper
  • AtomicReaper
I hope so, its a blank spot so I dont have answer choices to tell you this time. I am so so lost.
xMissAlyCatx
  • xMissAlyCatx
standard deviation (which I would assume you'd use .95)= square root of (x-22)squared etc.. over 10 try to solve for x? :/
AtomicReaper
  • AtomicReaper
Can you help set it up and I think I could handle it from there?

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