This study has used a probability sampling plan by a group of customers who registered to attend the auction in mid-December - the first week of January 2014.
The study establishes the sampling plan based on the probability of the customer groups that come and register to attend the auction in mid-December – the first week of January, 2014.
this study is a sample plan is likely to be from the group by using the customer to register to attend the auction in mid-December during the first week of the month - January 2014