In a survey with non-response, some respondents are underrepresented in the sample relative to the target population. The researcher applies inverse probability weighting (IPW) to adjust. If a respondent's probability of responding (propensity) is π_i = 0.20, their IPW weight is:

$w_i = \frac{1}{\pi_i} = \frac{1}{0.20} = 5$

In a survey where n = 500 respondents were obtained from a sample of 2,500 (20% overall response rate), IPW weights range from 2 to 8. Which statements correctly describe this scenario? (Select all correct.)