Yes, they can be treated as independent (less than 5% of the population).
Step-by-step explanation:
Since the selections are made without replacement, each selection affects the outcome of the next selection and, therefore, the selections are dependent.
Although they are dependent, the selections can be treated as independent if the sample size is no more than 5% of the total population. In this case, the sample size is 1235 adults out of a population of 15,958,866 adults. The percentage represented by the sample is:
Thus the selections can be treated as independent for the purposes of calculations.
For Enrique a 12 ounce bottle lasts for 16 weeks. This is a known fact. We need to find the amount of days or weeks an 18 ounce bottle of the same brand of shampoo last. Now 12 ounce bottle lasts = 16 weeks = (16 * 7) days = 112 days 18 ounce bottle lasts = (112/12) * 18 = 168 days = 168/7 weeks = 24 weeks So 18 ounce of the same brand of shampoo will last for 24 weeks.