Ronnie randomly sampled 80 college students, 50 living a dorm and the other 30 living in an apartment. She asked each how much they spent on food and beverages (non-alcoholic) within the last 7
days. A 95% confidence interval for the difference in the mean amount spent on food and drinks over the past 7 days between students living in a dorm and students living in an apartment
(dorm-apartment) is (-$25.80,-$11.20). Which of the following is true regarding the difference in sample means?
Choose the correct answer below.
O A. Students living in an apartment spent $18.50 more, on average, on food and drinks over the past 7 days than students living in a dorm.
OB. Students living in a dorm spent $18.50 more, on average, on food and drinks over the past 7 days than students living in an apartment.
O C. Students living in an apartment spent somewhere between $11.20 and $25.80, on average, on food and drinks over the past 7 days.
OD. Students living in a dorm spent somewhere between $11.20 and $25.80, on average, on food and drinks over the past 7 days.