Final answer:
Without specific research data, it's impossible to confidently state the percentage of customers likely to spend more due to helpful sales associates. Market research and surveys can be analyzed to understand this behavior.
Step-by-step explanation:
According to research, customers are more likely to spend more money if the sales associate is helpful. While the question presents four options of 20%, 50%, 75%, and 90%, without access to the specific research being referenced, it is not possible to determine the exact percentage. However, numerous studies suggest that customer service quality does influence consumer spending. A more satisfactory approach might involve analyzing market research or customer surveys from a reliable source to determine the impact of sales associates on customer purchasing behavior.
For example, a customer satisfaction survey — which asks consumers about their shopping experiences and whether the assistance received influences their spending — can shed light on this matter. From such surveys, researchers can calculate the population proportion of consumers influenced by the aid of sales associates and apply acceptable statistical techniques like hypothesis testing or confidence interval estimation to gauge the effect accurately.