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When an analysis of variance is performed on samples drawn from k populations, the mean square between treatments (MSTR) is _______________…

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When an analysis of variance is performed on samples drawn from k populations, the mean square between treatments (MSTR) is __________________.
(Where SSTR is treatment sum of squares and SST is total sum of squares.)
  • ASSTR/( k - 1)
  • BSST/(k - 1)
  • CSSTR/(k+1)
  • DSST/k
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MSTr (mean square treatment) provides a measure of the spread among the sample means x¯1, x¯2, . . . , x¯k (between-samples variation) by providing a weighted average of the squared differences between the sample means and the grand mean x¯¯:

1). SSTR/( k - 1)