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Statistics course and homework discussion. Elementary statistics.enFri, 01 Jul 2016 00:39:25 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum - Statistics
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Comparing two correlation coefficients
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Thu, 30 Jun 2016 21:13:24 GMTI am trying to compare 2 independent correlation coefficients. Can I compare 2 independent rs using fisher z transformation test which one is a...I am trying to compare 2 independent correlation coefficients. Can I compare 2 independent rs using fisher z transformation test which one is a Pearson’s r and the other is Spearman’s r or do they have to be the same?
]]>Statisticsjocoshttp://www.talkstats.com/showthread.php/65672-Comparing-two-correlation-coefficientsConfidence Interval
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Thu, 30 Jun 2016 20:50:32 GMTHi all,

I have a question for you that I hope one of you can answer:

You sample 29 apples from your farm's harvest of 291 apples. The mean weight of the sample is 9.724 grams with 9.110 standard deviation. What is the probability that the mean weight of all 291 apples is below 30 grams?

Please let me know how you got to the answer as well!

Thank you,
John
]]>Statisticsjohnkkimhttp://www.talkstats.com/showthread.php/65671-Confidence-IntervalSample size needed?
http://www.talkstats.com/showthread.php/65670-Sample-size-needed?goto=newpost
Thu, 30 Jun 2016 18:11:00 GMTHello.
I am trying to determine how many samples I would need in order to get 90% of all the subjects within +/-15% of a value. In other words,...Hello.

I am trying to determine how many samples I would need in order to get 90% of all the subjects within +/-15% of a value. In other words, how many samples would I need to consider in order for a calculation (such as average) to be within +/-15% of their actual value?

In my case, I am trying to estimate the market value of a house based on other houses in the vicinity. What is the math behind determining the number of samples needed of nearby property values in order to extrapolate the market value of the house in question within a +/-15% level of accuracy? I know there are complicating factors behind real estate but I am looking at a reduced number of assumptions.

I seem to remember that was near the magic number for statistical significance although I haven't done this for 15+ yrs and I've forgotten how to do this properly!