Word Count : 350

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## **(अ) $\alpha$ और $\beta$ के आकलक कैसे प्राप्त किए जा सकते हैं?** **उत्तर:** प्रतीपगमन के आकलक सामान्यतः **सर्वन्यून वर्ग विधि** (Least Squares Method) द्वारा प्राप्त किए जाते हैं। इसका उद्देश्य $\varepsilon$ के वर्गों के योग को न्यूनतम करना होता है। यानी हमें ऐसा $\hat{\alpha}$ और $\hat{\beta}$ खोजना होता है जिससे निम्नलिखित अभिव्यक्ति न्यूनतम हो: $$ \sum (Y_i ___ ______ ______ ______ ______.
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