anonymous
  • anonymous
I just need a little refresher on finding the percentage of measurements in intervals in order to check for normalcy, etc.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
I know how to do the things but the one thing that I forgot is how to calculate |dw:1447253034082:dw|
xMissAlyCatx
  • xMissAlyCatx
x bar usually means the mean (average)..
anonymous
  • anonymous
That "2s" part is stumping me. It's been a while since I calculated and I forgot hot to find it

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xMissAlyCatx
  • xMissAlyCatx
|dw:1447253114338:dw|
xMissAlyCatx
  • xMissAlyCatx
The "s" is standard deviation..
anonymous
  • anonymous
Yes, that part I got down. It's just knowing how to get the "2s"
xMissAlyCatx
  • xMissAlyCatx
I'm learning the same thing tbh. I have a formula for how to find "s".
anonymous
  • anonymous
I will attach something to help make it more clear what I am trying to achieve.
anonymous
  • anonymous
1 Attachment
xMissAlyCatx
  • xMissAlyCatx
Okay
xMissAlyCatx
  • xMissAlyCatx
Ohhh, the 2 in front of the "s" is just telling you which number it is..
anonymous
  • anonymous
I did this worksheet a while back and I forgot how I found the answers. It was so easy and I actually understood it but now my brain seems to not want to cooperate, haha
anonymous
  • anonymous
What do you mean?
xMissAlyCatx
  • xMissAlyCatx
|dw:1447253373002:dw| here's a formula for standard deviation.. as you see the numbers behind (or can be in front of) the x represent which one it is..
xMissAlyCatx
  • xMissAlyCatx
It is just saying that is your observation number...
anonymous
  • anonymous
I still have no idea, I'm sorry
xMissAlyCatx
  • xMissAlyCatx
Okay, so can you try to clarify what you're asking?
anonymous
  • anonymous
I guess what I'm trying to ask is how I can find the measurements that fall within the interval x ± 2s and so on
xMissAlyCatx
  • xMissAlyCatx
Have you learned about the 97%, 68%, 99.7% rule yet?
anonymous
  • anonymous
Yes, that's exactly the topic I am working on
xMissAlyCatx
  • xMissAlyCatx
Okay, well can you draw out the curve graph for me and I can help you from there..?
anonymous
  • anonymous
Goodness, I've never used the cruve graph before, tbh. I usually just go by equations
xMissAlyCatx
  • xMissAlyCatx
|dw:1447254773915:dw|
xMissAlyCatx
  • xMissAlyCatx
So since it is asking for 2s, you would do 100% - 96% since the 2nd one was 96, and you'd get 4%.. Then you divide 4 by 2 because the curve graph is symmetric.
xMissAlyCatx
  • xMissAlyCatx
So it should be 2%..
anonymous
  • anonymous
Ohhh, okay I see what you're saying. Well, thanks for helping me with this! I appreciate it (:
xMissAlyCatx
  • xMissAlyCatx
You're welcome lol. Sorry it too me so long to get what you were asking. :P

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