Gross profit is a key indicator of enterprise benefits and business performance fora company.Theregional manager of a clothes retailing chain company has noted that the gross profit margins(defined in a variable with the name of Profit)that individual shops are able toachieve may well be affected by the local advertising used on the radio (defined in a variable with the name of Radioads) and/or in newspapers(defined in a variable with the name of Newsads). If so, the company plans to adjust their advertising spending according to promote its profit. To explore the influence, market researchers sampled 100 shops in his regionand collected data. Data analysis was conducted in SPSS to support the decision making of this clothes retailing company.

Profit: gross profit as % of sales revenue

Radioads: radio advertising spending ()

Newsads: newspaper advertising spending ()

Imagining You are the market researcher in the case, will you choose probability-based or nonprobability-based sampling approach? Please Explain your considerations in detail