Final answer:
The statement is false. Planning poker is an agile estimation technique that relies on collective estimation rather than the opinion of one expert.
Step-by-step explanation:
The statement 'Planning poker uses the "wisdom of the single biggest expert" to estimate how long it will take to implement user stories' is False. Planning poker, also known as scrum poker, is an agile estimation technique used in software development, particularly within the Scrum framework. It relies on the collective estimation of a group of developers, rather than on a single expert. During a planning poker session, each team member provides their estimate for a user story by selecting a card from a deck of estimation cards, with each card representing a different level of effort. The process is repeated until a consensus is reached, taking advantage of the collective wisdom of the entire team rather than relying on the perspective of one expert.