Which improvement involves two groups performing the same survey so that an average may be taken?

Which improvement involves two groups performing the same survey so that an average may be taken?

• A. Get two groups doing the same survey so that an average may be taken
• B. Do counts only on weekends
• C. Do counts at a single location
• D. Use only one data collection form

Answer: (A)

Focusing on reliability through replication, having two groups do the same survey and then averaging the results reduces random errors in data. When different teams collect data, any unusual or mistaken values won’t dominate the outcome because the average cancels out much of this random variation. This gives a more stable and trustworthy estimate than a single survey. In contrast, counting only on weekends can introduce time-related bias, counting at one location limits geographic representativeness, and using just one data form can raise data-entry or design bias. So, repeating the survey with two groups and averaging is the clear way to improve reliability.

Focusing on reliability through replication, having two groups do the same survey and then averaging the results reduces random errors in data. When different teams collect data, any unusual or mistaken values won’t dominate the outcome because the average cancels out much of this random variation. This gives a more stable and trustworthy estimate than a single survey. In contrast, counting only on weekends can introduce time-related bias, counting at one location limits geographic representativeness, and using just one data form can raise data-entry or design bias. So, repeating the survey with two groups and averaging is the clear way to improve reliability.