In the test of hypotheses about the treatment effects and the blocking effects in a randomized block

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Question:

In the test of hypotheses about the treatment effects and the blocking effects in a randomized block design using ANOVA, if N = the total number of observations, C = the number of treatment levels, n = the number of blocks, the mean squares of error (MSE) is calculated by dividing the sum of squares errors (SSE) by ___.

a. (n-1)

b. (N-1)

c. (C-1) + (n-1)

d. (N-n-C+1)