
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
To understand the age distribution of 2000 athletes participating in a sports meeting, 100 athletes were sampled. Regarding this issue, the correct statements among the following are:

① The 2000 athletes are the population; ② Each athlete is an individual; ③ The sampled 100 athletes constitute a sample; ④ The sample size is 100; ⑤ This sampling method can adopt stratified sampling by age; ⑥ Each athlete has an equal probability of being selected.

Present the answer in LaTex format: \boxed{Your answer}
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