Stat question

QUESTION 11 Suppose that yet another researcher plans to conduct a similar study, but with key change to the sampling methodology. Specifically, the new researcher plans to add individuals without any stable housing of any kind in their sample, which were not included in the original study's sample. These individuals often live on the streets or in shelters for periods of time. It is well known that this group has dramatically higher mean rates of drug use compared to the original study's sample mean (which had a mean of 8.9 times per month). in light of this Information, what could you conclude about the original study's estimate of the true population mean for all people in Boston? What statistical concept describes the likely effect on the estimate