Thank you

]]>For example,

I have measured results of 30 samples Re is 3.43, 3.27 ,3.19, 3.17,3.17, 3.19, 3.19, 3.24, 3.1, 3.12 ,3.25, 3.2, 3.35, 3.2, 3.2, 3.22, 3.23, 3.18, 3.19, 3.31, 3.18, 3.08, 3.18, 3.17, 3.23, 3.19, 3.25, 3.26, 3.23, 3.18

mean = 3.2117, STD = 0.07

Company datasheet provided for Re is 3.08 and production tolerances +/- is 7.50%

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to find Cpk how do I calculate USL and LSL values?

Actually, which is the target value? ]]>

How can I calculate the sample size ? ]]>

The statistical agency projects that by 2011, the city will hit a population of 34,000

1. How can we calculate what the population may have been in 2007, 2008, 2009, and 2010

2. How can we calculate the percentage of increase in each of these years?

3. How can we estimate the population in 2012, 2013, 2014, 2015 and 2016?

NB: I do not know the model or linear algorithm used by the statistical agency to arrive at that projection. I am simply interested in estimating or maybe I should say extrapolating what the population should be in 2016 to enable me build up some assumptions for a sample survey frame. I am carrying out a social research in the field

I just need some ideas on how to do this statistically.

I just want a general idea on how to calculate the percentage increases ( and what this might translate to in actual figures) per year.

So i can use this to do an extrapolation of some sort into 2016. I want to use this to have a rough estimate of what the population may be this year and then find a mean population

I just need some ideas on how to do this statistically

Thank you

]]>With a population with less than 10,000 defects in a population of one million (less than 1% defects), will sampling be effective?

I believe most of the sampling size estimating formulas were developed with the idea that the number of defects were greater than 1% of the population. That is 3.9 Six Sigma level of quality.

]]>Also … there being another formula for sample size which using proportions (p-hat) and (1 – p-hat). How does that formula relate and compare to this formula ?

Thanks!

GOD Bless.

]]>This is excellent thank you! Would the calculation for the one-tailed test be the same just with a different z-score? So, instead of using the Z score of 1.96, the Z score 1.64 should be used?

]]>Thanks for sharing this info…

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