Question

Historically, the mean time between failure (the time it takes for a part to function or work) for a battery used in emergency lighting has been 12 hours. A consumer organization believes this not be true and asserts that the mean time between failure is not 12 hours. Classify the hypothesis test as either two-tailed, left tailed, or right tailed?

options:
Right Tailed
Left-Tailed
Two-Tailed

Answer 1

Ans:

Right Tailed Test

Explanation:

Here's a graph that will help highlight my point. The Manufacturer claims that their battery's last 12 hours, the very rightmost point of the graph, but the consumer claims that the battery in fact does not lie in that right section of the graph, but in the null section outside the 12 hour clamant. This test is to see whether or not the actual mean battery time lies within the red point of the graph, or within the null yellow part