please help

this is a research case study question

. Dr. Smithson conducts a study comparing sleeping habits and work productivity of participants. He finds that participants who wake up no later than 6:00 a.m. are more productive workers than participants who wake up later than 6:00 a.m. In his conclusions, he asserts that people are more likely to be good workers if they wake up early rather than later.

question

1) Imagine that Dr. Smithson instead wants to examine the perspectives of this group of participants on worklife balance and the sorts of resources and supports that enhance work productivity, and he designs and conducts a qualitative study. What approaches could he employ to enhance the credibility of the study?

2. Dr. Smithson conducts a study comparing sleeping habits and work productivity of participants. He finds that participants who wake up no later than 6:00 a.m. are more productive workers than participants who wake up later than 6:00 a.m. In his conclusions, he asserts that people are more likely to be good workers if they wake up early rather than later. Imagine that Dr. Smithson instead wants to examine the perspectives of this group of participants on worklife balance and the sorts of resources and supports that enhance work productivity, and he designs and conducts a qualitative study. What approaches could he employ to enhance the credibility of the study