In a supermarket, a department manager wishes to develop the supply of organic products. To justify his approach, he claims to his supervisor that $75\%$ of customers buy organic products at least once a month.
The supervisor wishes to verify his claims. To do this, he organizes a survey at the store exit. Of 2000 people interviewed, 1421 respond that they consume organic products at least once a month.
At the $95\%$ confidence level, what can we think of the department manager's claim?