Where the Daubert standard ensures that any scientific evidence

Where the Daubert standard ensures that any scientific evidence presented in a trial has been reviewed and tested
by the relevant scientific community, a Daubert challenge is a motion to exclude all or part of expert testimony
due to it failing to meet the Daubert standard.
Answer the following question(s):
Why do you think this is true? A PricewaterhouseCoopers study found that Daubert challenges based on
reliability of an expert’s testimony are “substantially more likely to be successful than challenges based on an
expert’s qualifications.”
Can you bring any additional research or opinion into this discussion?