Question

Let a represent the battery life of a brand a laptop, and let b represent the battery life of a brand b laptop. The mean difference in battery life between these two brands of laptops, d = a – b, is –3.25 hours. What is the correct interpretation of this value?

1) On average, brand b gains 3.25 hours of battery life daily.
2) On average, brand a loses 3.25 hours of battery life daily.
3) Both brands are typically losing 3.25 hours of battery life daily.
4) On average, brand b's battery life lasts 3.25 hours longer than brand a.

Answer 1

The correct interpretation of the mean difference in battery life between brand a and brand b laptops being -3.25 hours is that, on average, brand b's battery life lasts 3.25 hours longer than brand a.

Step-by-step explanation:

The correct interpretation of the mean difference in battery life between brand a and brand b laptops being -3.25 hours is that, on average, brand b's battery life lasts 3.25 hours longer than brand a. So, option 4) On average, brand b's battery life lasts 3.25 hours longer than brand a is the correct interpretation.