A Research Group Hypothesizes That Diet Influences the Distribution of Bacterial

question 74

Multiple Choice

A research group hypothesizes that diet influences the distribution of bacterial species inhabiting the human digestive system.The researchers define two populations with very different diets-one in England and another in Africa-for sample collection.They take fecal samples from each group and measure the percentage of each species of bacteria present in the samples.How is this investigation classified and why?

• A) This investigation is a controlled investigation because it was carried out using defined study populations.
• B) This investigation is a controlled investigation because controlled methods were used for the collection and analysis of fecal samples.
• C) This investigation is a comparative study because it compares a characteristic of two different groups that could be influenced by many variables.
• D) This investigation is a comparative study because it tests a hypothesis that was formulated by comparing the diets of two populations.
• E) This investigation is both a controlled and comparative study because it controls all but one variable influencing two study groups and then compares how that variable differs.

---

Definitions:

Depreciation Expense

The allocation of the cost of a tangible asset over its useful life, representing the wear and tear or obsolescence of the asset.

Accumulated Depreciation

The total amount of depreciation expense that has been recorded against a fixed asset since it was put into use, reducing its book value on the balance sheet.

Asset Turnover

A financial ratio that measures how efficiently a company uses its assets to generate sales, calculated by dividing total revenues by average assets.

Net Sales

The revenue from sales transactions after deducting returns, allowances, and discounts.