An analyst takes a random sample of 25 firms in the telecommunications industry and constructs a confidence interval for the mean return for the prior year.Holding all else constant,if he increased the sample size to 30 firms,how are the standard error of the mean and the width of the confidence interval affected? 
Definitions:
Social Construction
A concept or perception of reality influenced and constructed by societal norms and interactions.
Microsystem
A concept in ecology and environmental science referring to the smallest unit of a habitat where organisms interact with each other and their environment.
Heritage
The traditions, practices, and beliefs handed down from previous generations, often forming part of a person's cultural identity.
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