Suppose a department store wants to estimate µ, the average age of the customers in its contemporary apparel department, within 3.1 years with 90% confidence. How large a sample would be required if the standard deviation is 7.2 years?

Catherine saved some money and plans to add the same amount each week to her savings account. the table represents the number of weeks that she will save, x, and the total amount of money that she will have in her account, y. weeks, x dollars in account, y 4 74 6 86 9 104 11 116 which linear equation represents catherine’s situation?