1. The Survey on Income and Living Conditions (SILC) collects information on the income and living conditions of different types of households in Ireland. Consult the CSO website (link provided below) to answer the following questions. https://www.cso.ie/en/methods/surveybackgroundnotes/ surveyonincomeandlivingconditions/ a) b) c) d) e) f) What type of sampling is used for the SILC: stratified, clustered, random? What are the strata (if any)? How many strata are there? Is the SILC representative at the county level? What is the cluster (if any)? How many clusters are selected? How are they selected? What is the sampling unit? How are these units selected? What determines the probability of a household being selected for the SILC?