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Wilcoxon signed ranks test uses ranks of data

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Unformatted text preview: sign Test statistic if n … 25: x Test statistic if n 7 25: 1n> 2 Reject H0 if test statistic … critical values. Wilcoxon Signed-Ranks Test: Uses ranks of data consisting of matched pairs; based on ranks of differences between pairs of values. Used to test null hypothesis that two populations have same distribution. T : Smaller of two rank sums (sum of absolute values of negative ranks; sum of positive ranks) z= 1x + 0.52 - 1n> 22 Kruskal-Wallis Test: Used to test null hypothesis that three or more independent samples are from populations with same distribution. Requires at least five observations in each independent sample of randomly selected values. N: R1: n1: Total number of observations Sum of ranks for Sample 1 Number of values in Sample 1 Statistical Process Control Process Data: Data arranged according to some time sequence. Run Chart: Sequential plot of individual data values over time Control Chart of a process characteristic: Sequential plot over time of the characteristic values, including a cent...
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