A multinational firm manufactures several types of 1280 × 1024 LCD displays in several locations. They designed a sampling experiment to analyze the number of pixels per screen that have significant color degradation after 52,560 hours (six years of continuous use) using accelerated life testing. The Excel ANOVA table for their experiment is shown below. Some table entries have been obscured. The response variable (Y) is the number of degraded pixels in a given display. Source of VariationSSdfMSFCountry of origin 202.9 101.45 4.163475 Display type 233.2333 58.30833 Interaction 147.7667 18.47084 Error 1096.5 45 24.36667 Total 1680.4 59 How many countries were studied?
A. 1
B. 2
C. 3
D. 4
Answer: C
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