For the sprint backlog, I read that the stories are broken into tasks, and estimated.  Are these estimates typically development hours only, or development + QA?  What are these hours typically consisting of?Thanks.
Sprint Backlog Task Estimates - What Are the Hours Made Of?
scrum;sprint
The sprint backlog tasks to complete a user story should contain everything that required to complete the story. This may include:DesignTechnology selectionStudies for trying out different approachesImplementationUnit testingQABug fixingAcceptance testsDocumentationLegal FinanceOf course, you'll never capture everything during planning (teams I've been on tend to miss between 20% and 30% of the hours required)... but that doesn't mean you shouldn't try!