A major department store chain is interested in estimating the mean amount its credit card customers spent on their first visit to the chain's new store in the mall. Fifteen credit card accounts were randomly sampled and analyzed with the following results: 
= $50.50 and S = 20. Assuming the distribution of the amount spent on their first visit is approximately normal, what is the shape of the sampling distribution of the sample mean that will be used to create the desired confidence interval for μ?
Definitions:
Return on Total Assets
A financial ratio that measures a company's ability to generate net income from its total assets, indicating efficiency in asset use.
Total Assets
The sum of all resources owned by a company, valued and reported on the balance sheet, representing the total wealth of the company.
Income Statement
A financial record presenting the financial performance of a company, including its income, expenses, and profit, within a set period.
Gross Margin Percentage
A financial metric that shows the proportion of revenue that exceeds the cost of goods sold, expressed as a percentage. It is used to assess a company's financial health and operational efficiency.
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