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:
Positive Profits
Financial gain experienced by a business when the total revenue exceeds the total costs and expenses incurred in producing goods or services.
Demand Fluctuates
Demand fluctuates refers to the constant variations in consumer desire for products or services, which can be influenced by factors like season, price, and trends.
Pollution Laws
Legislation and regulations designed to control or reduce the release of harmful substances into the environment.
Competitive Industry
An industry characterized by many firms, free entry and exit, and products that are similar but differentiated.
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