Q. Data from this study came from the "National Women's Study Replication." The sample of 3,001 women was formed from two US population samples: a national cross-section of 1000 women aged 35 and older. Weights were created and used for all analyses with this sample to maximize representativeness by bringing the distribution of sample demographics in line with 2005 US We used random-digit-dial (RDD) methodology involving three steps. First, the sample was geographically stratified with sample allocation proportionate to population distribution. Second, a sample of assigned telephone banks was randomly selected from an enumeration of the Working Residential Hundreds Block (defined as each block of potential telephone numbers with an exchange that comprises one of more residential listings) within the active telephone exchanges within the strata. Third, a two-digit number was randomly generated by computer for each Working Residential Hundreds Block. All interviews were conducted among Jan 23rd and Jun 26th, 2006.

Illustrate what type of sampling was this study? Illustrate what is your analysis of this approach? Illustrate what are the advantages and disadvantages of this approach?