Ten Different Families Were Tested for the Average Number of Gallons

Multiple Choice

Ten different families were tested for the average number of gallons of water they used per day before and after viewing a conservation video.A 90% confidence interval for the difference of the means after and before the training, $\mu _ { A } - \mu _ { B }$ was determined to be (-10.8, -4.2) .

A) We know that 90% of families will use between 4.2 and 10.8 fewer gallons of water each day after viewing the conservation video.
B) Based on this sample, we are 90% confident that the average decrease in daily water consumption after viewing the conservation video is between 4.2 and 10.8 gallons.
C) We are 90% confident that a randomly selected family who has viewed the video will use between 4.2 and 10.8 more gallons of water per day compared to a randomly selected
Family who has not viewed the video.
D) Based on this sample, we are 90% confident that the average increase in daily water consumption after viewing the conservation video is between 4.2 and 10.8 gallons.
E) We are 90% confident that a randomly selected family who has viewed the video will use between 4.2 and 10.8 fewer gallons of water per day compared to a randomly selected
Family who has not viewed the video.