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Part BCSIR NET December 2024only-one-side-of-the-interval-can-fail

Only one side of the interval can fail

Suppose that the probability density function of the random variable X is f(x)=2(θ−x)/θ2f(x) = 2(\theta - x)/\theta^{2} if 0≤x≤θ0 \le x \le \theta, and 0 otherwise, where θ>0\theta > 0 is an unknown parameter. Based on a single observation X, the confidence coefficient of the confidence interval [(2/5)X, (5/2)X] for θ\theta is

  1. A.0.36✓ Correct
  2. B.0.55
  3. C.0.76
  4. D.0.95

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward, and why this one tests boundary and endpoint.

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50 are analysed free — try those first.

The trap it tests

Boundary and endpoint

The statement turns at the edge of the interval, the domain, or the parameter range.

Drill statements like this

Related counterexample: The MLE is unbiased

More on this topic

The chapter behind this: Maximum likelihood and the method of moments — free to read

From Estimation › MLE and method of moments

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