Answer:
A) The use of both techniques ( i.e. questionnaire and Interview )
B) The sampling method should include an equal number of workers from each shift, this is to ensure that every shift's opinion is broadly covered.
Step-by-step explanation:
A) The best approach in resolving this problem is the application of both questionnaires and interviews, this is because the questions will be covered in both the questionnaire and interview therefore a more detailed/accurate answer can be gotten by combining both processes
B) The sampling method should include an equal number of workers from each shift, this is to ensure that every shift's opinion is broadly covered.