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:
IRS
The Internal Revenue Service, a U.S. government agency responsible for tax collection and tax law enforcement.
Tax Tables
Charts used to determine the amount of tax owed based on income levels, provided by tax authorities for calculating liabilities.
Tax Rate Schedules
Charts or tables provided by tax authorities that outline the tax rates applicable to different income levels.
Tax Liability
The total amount of tax owed to a taxing authority by an individual, organization, or corporation.
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