Identify the sampling method (simple random sampling, systematic sampling, convenience sampling, cluster sampling, or stratified sampling) in the following study. A radio station predicts movie award winners by polling listeners who voluntarily respond by phone. What type of sampling is used? Simple random sampling Systematic sampling Convenience sampling Cluster sampling Stratified sampling

Step 1 ：The question is asking to identify the type of sampling method used in a specific scenario. In this case, a radio station is predicting movie award winners by polling listeners who voluntarily respond by phone.

Step 2 ：This seems to be a case of convenience sampling, as the radio station is simply polling those who are readily available and willing to participate.

Step 3 ：There is no mention of any systematic approach to selecting the sample, nor is there any indication that the sample is randomly selected from a larger population. The sample is also not divided into subgroups or clusters.

Step 4 ：Therefore, the most likely answer is convenience sampling.

Step 5 ：Final Answer: \(\boxed{\text{Convenience sampling}}\)