The effects of developer strength (factor A) and development time (factor B) on the density of photographic plate film were being studied. Two strengths and two development times were used, and four replicates in each of the four cells were evaluated. The results (with larger being best) are shown in the following table:
At the 0.05 level of significance, a. is there an interaction between developer strength and development time? b. is there an effect due to developer strength? c. is there an effect due to development time?
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