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$1 \leftarrow \quad$ Identify the type of sampling used (random, systematic, convenience, stratified, or cluster sampling) in the situation described below.
A man is selected by a marketing company to participate in a paid focus group. The company says that the man was selected because his name is among the first 400 in the phone number listings.
Which type of sampling did the marketing company use?
Stratified sampling
Cluster sampling
Systematic sampling
Convenience sampling
Random sampling

Step 1 ：Identify the type of sampling used (random, systematic, convenience, stratified, or cluster sampling) in the situation described below.

Step 2 ：A man is selected by a marketing company to participate in a paid focus group. The company says that the man was selected because his name is among the first 400 in the phone number listings.

Step 3 ：Which type of sampling did the marketing company use? Stratified sampling, Cluster sampling, Systematic sampling, Convenience sampling, Random sampling.

Step 4 ：The marketing company selected the man based on his position in the phone number listings, which suggests that they used a systematic approach to their sampling.

Step 5 ：In systematic sampling, every nth member of a population is selected to be included in the sample. In this case, the 'n' could be defined as the position in the phone number listings.

Step 6 ：Final Answer: The type of sampling used by the marketing company is \(\boxed{\text{Systematic sampling}}\).