Let Y;. Yz. --.. Y, denote a random sample from the probability density function e , y20, 0, elsewhere. Show that Y1) = min(Y1, Y2, .... Y,) is sufficient for e. %3!

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Let \( Y_1, Y_2, \ldots, Y_n \) denote a random sample from the probability density function

\[
f(y \mid \theta) = 
\begin{cases} 
e^{-(y - \theta)}, & y \geq \theta, \\
0, & \text{elsewhere}.
\end{cases}
\]

Show that \( Y_{(1)} = \min(Y_1, Y_2, \ldots, Y_n) \) is sufficient for \( \theta \).
Transcribed Image Text:Let \( Y_1, Y_2, \ldots, Y_n \) denote a random sample from the probability density function \[ f(y \mid \theta) = \begin{cases} e^{-(y - \theta)}, & y \geq \theta, \\ 0, & \text{elsewhere}. \end{cases} \] Show that \( Y_{(1)} = \min(Y_1, Y_2, \ldots, Y_n) \) is sufficient for \( \theta \).
**Task:**

Find a function of \( Y_{(1)} \) that is an MVUE for \( \theta \).

---

**Explanation:**

- **\( Y_{(1)} \):** This indicates the smallest order statistic from a sample.
- **MVUE:** Stands for Minimum Variance Unbiased Estimator, which is an estimator that has the lowest variance among all unbiased estimators for a parameter \( \theta \).

In statistical estimation, identifying an MVUE is crucial because it ensures that we estimate parameters as accurately and precisely as possible without systematic error.
Transcribed Image Text:**Task:** Find a function of \( Y_{(1)} \) that is an MVUE for \( \theta \). --- **Explanation:** - **\( Y_{(1)} \):** This indicates the smallest order statistic from a sample. - **MVUE:** Stands for Minimum Variance Unbiased Estimator, which is an estimator that has the lowest variance among all unbiased estimators for a parameter \( \theta \). In statistical estimation, identifying an MVUE is crucial because it ensures that we estimate parameters as accurately and precisely as possible without systematic error.
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