Final answer:
The data provided is insufficient to determine the crew size that averages the greatest productivity in square yards installed per week.
Step-by-step explanation:
To determine the crew size that averages the greatest productivity in square yards installed per week, we can look at the results provided. However, since the results are not given, we cannot determine the best crew size with the information provided. Without the data showing the productivity levels for each crew size, it is impossible to identify which crew size is the most productive. Therefore, the answer is D) Data is insufficient to determine.