The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He surveys every 10th customer that comes into the store and asks them whether they are comfortable, yes or no.

What survey methodology is this?

The manager of a QFC is concerned that customers may think the store's temperature may be too warm. He surveys every 10th customer that comes into the store and asks them whether they are comfortable, yes or no. 



A: Stratified Sampling
B: Clustered Sampling
C: Simple Random Sampling
D: Systematic Sampling


Answer: D


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