I am a prospective PhD student at Wharton's Statistics and Data Science department. Please navigate to the 'Doctoral Journey' page and identify the typical duration of the program, the key milestones or stages involved, and whether there's a qualifying exam or dissertation defense requirement.
Navigate to 'https://statistics.wharton.upenn.edu'. Click on the 'PhD' link. Click on the 'Doctoral Journey' link. Identify the typical duration of the PhD program. Locate and list the key milestones or stages involved in the program. Determine if there is a qualifying exam or dissertation defense requirement. Synthesize all collected information into a concise answer.
The agent successfully navigates to the 'Doctoral Journey' page. The typical duration of the PhD program is stated. Key milestones or stages of the program (e.g., coursework, qualifying exams, dissertation proposal, dissertation defense) are identified. It is confirmed whether a qualifying exam or dissertation defense is required.