After a survey, BuildStar Construction Company, which owns thirty percent of market share, started adding an elevator to any building having more than three levels. It has been three years since this change was brought and people in the town have reported an increase in the number of cardiac problems. Health experts claim that not using the stairs in daily life is responsible for increasing instances of heart trouble in the city.
Which of the following statement if true would pose a doubt on the conclusion of the health experts?
Reveal answer
Fill a bubble to check yourself