4 Let Y₁, Y., Y, constitute a random sample from the probability density function given by f(y)=(-y), 0≤ y ≤0, :{(²³) elsewhere. a Find an estimator for by using the method of moments.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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**Problem 9.74**

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

\[
f(y \mid \theta) = 
\begin{cases} 
\left( \frac{2}{\theta^2} \right) (\theta - y), & 0 \leq y \leq \theta, \\
0, & \text{elsewhere}.
\end{cases}
\]

**Tasks:**

a. Find an estimator for \( \theta \) by using the method of moments.

b. Is this estimator a sufficient statistic for \( \theta \)?
Transcribed Image Text:**Problem 9.74** Let \( Y_1, Y_2, \ldots, Y_n \) constitute a random sample from the probability density function given by \[ f(y \mid \theta) = \begin{cases} \left( \frac{2}{\theta^2} \right) (\theta - y), & 0 \leq y \leq \theta, \\ 0, & \text{elsewhere}. \end{cases} \] **Tasks:** a. Find an estimator for \( \theta \) by using the method of moments. b. Is this estimator a sufficient statistic for \( \theta \)?
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