A Multinational Firm Manufactures Several Types of 1280 × 1024

Multiple Choice

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. $$\begin{array} { | l | c | c | c | c | } \hline \text { Source of Variation } & \text { SS } & d f & M S & F \\\hline \text { Country of origin } & 202.9 & & 101.45 & 4.163475 \\\hline \text { Display type } & 233.2333 & & 58.30833 & \\\hline \text { Interaction } & 147.7667 & & 18.47084 & \\\hline \text { Error } & 1096.5 & 45 & 24.36667 & \\\hline \text { Total } & 1680.4 & 59 & & \\\hline\end{array}$$ How many countries were studied?

A) 1
B) 2
C) 3
D) 4