Question groups reside within quizzes and their two-fold purpose is to organize questions within a quiz and present the questions in the group in randomized order. A question group does not exist outside of the quiz in which it has been created.

If the instructor wants questions randomized on a quiz they should use Questions Groups. Question groups allow instructors to organize a large number of questions into groups, with the option to select the desired number of questions to display on the quiz with a set point value for all questions in the group. When the point value is set for the group it will override the point value set at the question level.

Ways to Add Questions to a Group

Create a Group and Create Questions in that Group

Click the + New Question Group button on the Questions tab of the quiz to create a new group. Next, click the + button in the title bar of the group to create a new question within that group. These questions are not in a question bank. This option is advisable if you don't intend to use the questions again in another quiz or in another course.

Drag and Drop Existing Questions into a Group

Click the + New Question Group button on the the Questions tab of the quiz to create a new group. Next, add questions already on the Questions tab to this new group by clicking and dragging each question into the group space. These questions that you've already added to the quiz could be from a quiz bank or just be questions that you have added individually to the quiz.

Create a Question Group and Add Specific Questions from a Question Bank

This method allows an instructor to randomize questions on a quiz, reuse the questions on other quizzes, but select certain questions in a question bank. First create the question bank. Then in the quiz, click the + New Question group button to create a new question group. Click the Find a Question button and choose the bank and then the questions from that bank. Drag these questions into the new group.

Create a Question Group that is Linked to a Question Bank

This method allows the instructor to randomize questions on a quiz, reuse the questions on other quizzes, and use all the questions in the selected question bank. First create the question bank. Then in the quiz, click the + New Question Group button to create a new question group. Click the Link to Bank option and select a question bank. Each question group can only link to one question bank. You can add multiple question groups to a quiz.

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The questions reside within the Question Bank and the instructor does all the edits within the bank.
Although you can make changes to the questions after a quiz is published, students who have already opened or completed the quiz will not see any of the changes.
Questions that are linked to a Question Bank cannot be automatically regraded. Students submissions must be manually regraded.