A firm is studying the effect of work shift and parts supplier on its defect rate (dependent variable is defects per 1000) .The resulting ANOVA results are shown below (some information is missing) . 
How many suppliers were there?
Definitions:
Dual Facilities
refers to a strategy where a company operates two or more facilities, typically manufacturing plants or distribution centers, in different locations to better serve various markets or to enhance production capabilities.
Stable Output
The consistent production level of goods or services over a period, unaffected by fluctuations in demand.
Varying Volume
Fluctuations in the quantity of products or services produced or sold over a specific period, often influenced by market demand, seasonality, or production capacity.
Pricing Decisions
The process of determining the price at which a company will sell its products or services.
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