Final answer:
There is no information provided about the advertising company that conducted marketing research on Walmart in Oklahoma City, nor the percentage of people who shopped at Walmart in the last year.
Step-by-step explanation:
The name of the advertising company that conducted marketing research regarding Wal-Mart in Oklahoma City is not provided in the given information. Therefore, we are unable to determine the specific company mentioned.
Similarly, the percent of people in the city that the company found had shopped at Wal-Mart in the last year is also not mentioned. Without this specific data, we cannot provide the exact percentage.
It's important to note that marketing research is commonly conducted by various companies to gather data and insights about consumer behavior and preferences.