In constructing confidence interval estimate for the difference between the means of two populations,where the unknown population variances are assumed not to be equal,summary statistics computed from two independent samples are as follows: 
, 
, 
, 
, 
,and 
.Construct 90% confidence interval for 
.
Definitions:
Social Capital
The networks, relationships, and norms that shape the quality of society’s social interactions, enhancing cooperation for mutual benefit.
Bowling Alone
A book by Robert D. Putnam that argues America has seen a decline in social capital and community engagement.
Competitive Play
A form of play or activity where individuals or teams compete against each other with the objective of winning or achieving a goal.
Many Nuances
Many nuances refer to the subtle or minor variations within phenomena or situations, often influencing outcomes or interpretations in complex ways.
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