Question:
Expected sample size of SPRT is a/an:
Expected sample size of SPRT is a/an:
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SPRT's sample size N is random. Its expectation E(N) is called the ASN.
Updated On: Jul 4, 2026
- Outgoing quality limit
- Standard of outgoing quality
- Average sample number
- Outgoing sample number
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The Correct Option is C
Solution and Explanation
Step 1: The Sequential Probability Ratio Test (SPRT), developed by Wald, tests a hypothesis by drawing observations one at a time until a decision boundary for acceptance or rejection is crossed.
Step 2: Since the number of observations needed, N, is itself a random variable, we consider its expectation \(E(N)\), which is called the Average Sample Number (ASN).
Step 3: The ASN gives the expected sample size required by the SPRT for a given true value of the parameter, and it is a key efficiency measure of sequential tests, usually smaller than the fixed sample size needed by an equivalent fixed sample test.
Step 4: Outgoing quality limit and standard of outgoing quality are acceptance sampling concepts, not sample size measures, and outgoing sample number is not a defined statistical term.
Final Answer: Option (C), Average Sample Number.
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