CompTIA Data+ (DA0-001) — Question 238

A customer survey reveals 90% positive feedback. Which of the following statistical methods would be best to utilize to determine the reliability of a data set and predict how a larger sample of customers over the same time period might respond?

Answer options

• A. Calculate a high variance on survey responses.
• B. Calculate the maximum range of the survey responses.
• C. Calculate a low standard deviation on survey responses.
• D. Remove any data more than 1 standard deviation from the mean.

Correct answer: C

Explanation

Calculating a low standard deviation on survey responses (option C) indicates that the responses are closely clustered around the mean, suggesting reliability in the data set. The other options either do not provide a measure of consistency (A and B) or suggest removing data that could be valuable for understanding the overall response (D).