Quality ratings of a new line of take-home refrigerated entrées were obtained from three randomly formed groups of customers who were exposed to different types of advertisements about the product.One group,with 55 customers,saw ads that were designed to undermine their expected positive association of quality with advertisements;a second group of 36 customers saw ads that were designed to affirm their positive association of quality with advertisements;the third group with 36 subjects served as the control group.The following is the ANOVA table obtained from the data in the study.(Some entries have been replaced by **.) 
What is the estimate of the common population standard deviation ?
Definitions:
External Communication
The process of sharing information between an organization and outside entities or the public.
Organizational Pattern
The structure or arrangement of ideas and elements within a text, speech, or document, aiding in clarity and comprehension.
Bad News
Bad News is a term used to describe information that is unpleasant, disappointing, or unfavorable, often requiring careful communication.
Superiors
Individuals who hold higher positions or ranks within an organizational hierarchy, often with authority or supervisory responsibilities over others.
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