Statistics for Maintenance Modelling: Continuous Lifetime Distributions 2

# Question 6¤

Which of the following distributions model the situation where items wear out, i.e. the hazard rate increases as t ? For each distribution, click yes or no, and when you've finished click on "Check Answer".

Exponential
Yes
No
That's right, the hazard rate is constant.
No, it doesn't because the hazard rate is constant.
Weibull
Yes
No
Yes that's right. It does, if > 1.
No, it does if > 1.
Extreme value
Yes
No
Yes that's right.
No, it doesn't.
Normal
Yes
No
Yes that's right.
No, it doesn't.
Lognormal
Yes
No
That's right, because the hazard rate decreased to zero as t .
No, it doesn't because the hazard rate decreased to zero as t .
Gamma
Yes
No
Yes that's right. It does if N > 1.
No, it does if N > 1.
Logistic
Yes
No
That's right, the hazard function levels off to -1 for large t.
No, it doesn't because the hazard function levels off to -1 for large t.
Loglogistic
Yes
No
That's right, because for a large enough t the hazard rate decreases.
No, it doesn't because for a large enough t, the hazard rate decreases.
Pareto
Yes
No
That's right, the hazard rate decreases with t.
No, it doesn't because the hazard rate decreases with t.