Question

We are conducting a study to determine the functional lifetimes of battery. We received a batch of identical electrical cars and we will follow them for the next 120 months. One and a half year after the study starts, we received news that one of the car has an accident. As a result, that car was totaled (i.e., destroyed beyond repair). We were sent the police report of the accident. The report showed the date of the accident. So, what is the status of that car? Left Censored Interval Censored Right Censored No Censoring Status None of the Above When the time tends to infinity, what will be the cumulative hazard function value? Zero One Positive Infinity Negative Infinity Can Be Any Value

Answer 1

The status of the totaled car is Left Censored and the cumulative hazard function value tends to Positive Infinity as time goes to infinity.

Step-by-step explanation:

The status of the car that was totaled in the accident is Left Censored. Left censoring occurs when the event of interest (in this case, the functional lifetime of the battery) is not observed before a certain point in time (in this case, the date of the accident).

When the time tends to infinity, the cumulative hazard function value will be Positive Infinity. The cumulative hazard function represents the accumulated risk of an event happening, and as time increases without any limit, the risk also increases without any limit.