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 attached Excel document called PHOTO.
At the 0.05 level of significance,
A. is there an interaction between the developer strength and development time?
B. is ther an effect due to development strength?
C. Is there an effect due to development time?
D. Plot the mean density for each developer strength for each development time.
E. What can you conclude about the effect of developer strength and development time on density?
Please use Excel whenever possible.
In the solution, detailed tutorial is presented as to how to interpret the interaction between two factors. Meanwhile, instructions are also provided as to how to interpret the effect from single factor.