You are given the following information obtained from a random sample of 5 observations. 
At a 10% level of significance, use Excel to determine whether or not the mean of the population from which this sample was taken is significantly less than 21. (Assume the population is normally distributed.)
Definitions:
Total Asset Turnover Ratio
A financial metric that measures the efficiency of a company at using its assets to generate revenue.
Sales Revenue
The income received from selling goods or services over a period of time.
Average Total Assets
The mean value of all the assets a company owns, calculated over a specific period of time, typically used to assess company size or efficiency.
Prepaid Rent
Prepaid rent refers to payments made for rent in advance before it is due, recorded as an asset on the balance sheet until the period to which it applies passes.
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