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squared
A chi-squared test (also chi-square or χ2 test) is a statistical hypothesis test that is valid to perform when the test statistic is chi-squared distributed under the null hypothesis, specifically Pearson's chi-squared test and variants thereof. Pearson's chi-squared test is used to determine whether there is a statistically significant difference between the expected frequencies and the observed frequencies in one or more categories of a contingency table.
In the standard applications of this test, the observations are classified into mutually exclusive classes. If the null hypothesis that there are no differences between the classes in the population is true, the test statistic computed from the observations follows a χ2 frequency distribution. The purpose of the test is to evaluate how likely the observed frequencies would be assuming the null hypothesis is true.
Test statistics that follow a χ2 distribution occur when the observations are independent. There are also χ2 tests for testing the null hypothesis of independence of a pair of random variables based on observations of the pairs.
Chi-squared tests often refers to tests for which the distribution of the test statistic approaches the χ2 distribution asymptotically, meaning that the sampling distribution (if the null hypothesis is true) of the test statistic approximates a chi-squared distribution more and more closely as sample sizes increase.
as title, am looking for square edge grid switches.
I rewired a little bungalow and wired it for grid switches beside double sockets in kitchen due to space restraints. Have fitted out in M2 (from CEF) square edge…. But now have found out M2 don’t do grid switches in that style….. Found out...
I have a home that has a 600W panel and three 200W subpanels SquareD QO (quick grip) panels. I’m looking for an energy monitoring solution (other than the electric company). I know that SquareD has Wiser solution for the 200W panels (same as the Sense monitoring..I think), but it looks like the...
Help brain has turned to mush.
A simple ring circuit 2.5 twin and earth.
can supply upto an area of 100meter squared, stated in IEE Regs. Right. (O yes please negate any correction factors that might normally apply).
And if i remember that is: 100 meters squared = 100meters x 100meters
simply...
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