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what is the difference between a two-sample t-test and a paired t-test When you use a paired T-test, you are essentially doing a one-sample test, where your one sample consists of the paired differences between outcomes in two groups If you create a new sample of these difference values and then apply the formula for a one-sample T-test, you will see that this is equivalent to the paired test
How to resolve the ambiguity in the Boy or Girl paradox? 1st 2nd boy girl boy seen boy boy boy seen girl boy The net effect is that even if I don't know which one is definitely a boy, the other child can only be a girl or a boy and that is always and only a 1 2 probability (ignoring any biological weighting that girls may represent 51% of births or whatever the reality is)
Effect of linear transformation on the Pearson correlation coefficient Sure there's more than one! The one I am quoting is from a popular elementary statistics book (Freedman, Pisani, and Purves, Statistics, any edition) Their definition is "Convert each variable to standard units The average of the products gives the correlation coefficient " It is mathematically equivalent to any other formula for the correlation coefficient One advantage it has is that it
FMCW radar signal processing: FFT with nonuniform sampling points I have a behavioral model for a PLL that generates a chirp signal for an FMCW radar To improve efficiency, the model outputs only the zero-crossing points at the negative edge From this zero-cros
A question about cross correlation - Signal Processing Stack Exchange Let x[n] x [n] and y[n] y [n] be two discrete time signals of length N N define for all n ∈ [0, N − 1] n ∈ [0, N 1] and zero otherwise In the book Digital Signal Processing by Michael Weeks the cross correlation of x[n] x [n], y[n] y [n] is defined as
Understanding Matched Filter, delay - Signal Processing Stack Exchange Any causal filter will have delay since a causal filter is the weighted sum of past inputs (and for an IIR case past outputs as well) If the filter is a linear phase filter (as guaranteed by using an FIR filter with symmetric coefficients), the delay is conveniently (N − 1) 2 (N 1) 2 where N N is the number of coefficients in the filter Given that, if you use an odd length filter (N odd
What are high frequencies and low frequencies in a signal? Read about FFT in MATLAB You cannot always "see" the high and low frequencies by plotting the signal in the time domain, though in a few toy examples, the results would be obvious enough
probability - What is the expected number of children until having the . . . A couple decides to keep having children until they have the same number of boys and girls, and then stop Assume they never have twins, that the "trials" are independent with probability 1 2 of a boy, and that they are fertile enough to keep producing children indefinitely