What type of customer is likely to be very certain about their purchases?

The type of customer who is very certain about their purchases is best identified as a Decided Customer. This customer typically has a clear understanding of what they want and has made a firm decision before entering the shopping environment. Decided Customers often do thorough research and know their preferences, which leads to confident purchasing decisions.

In contrast, Impulsive Buyers are characterized by their spontaneous buying habits, often making purchases without prior planning or certainty. Doubtful Buyers tend to hesitate and may second-guess their decisions during the shopping process, which contrasts sharply with the assured nature of a Decided Customer. Casual Shoppers may browse and explore products without a committed intention to buy, reflecting a more laid-back approach and lack of certainty.

Overall, the Decided Customer stands out as the individual who arrives ready to make a purchase with conviction, making this the correct answer.