यदि x = 3u + 1 और y = 4v + 2 है और u और v के बीच प्रतिगमन गुणांक 1.2 है, तो x और y के बीच प्रतिगमन गुणांक ज्ञात कीजिए?

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SSC CGL Tier-II ( JSO ) 2017 Official Paper ( Held On : 22 Feb 2018 )
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  1. 0.8
  2. 1
  3. 0.9
  4. 1.5

Answer (Detailed Solution Below)

Option 3 : 0.9
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Detailed Solution

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1 - दिया गया है

X = 3u + 1

Y = 4v + 2

u और v के बीच प्रतिगमन गुणांक = (buv) = 1.2

सूत्र

प्रतिगमन गुणांक मूल से स्वतंत्र होते हैं लेकिन पैमाने पर निर्भर करते हैं।

यदि x = 3u + 1 और y = 4v + 2 है

तब buv = (a/c) × bxy

गणना

प्रश्नानुसार

x = 3u + 1

⇒ u = x/3 – 1/3

इसी प्रकार

v = y/4 – 1/2 

buv = (a/c) × bxy का उपयोग करने पर

⇒ 1.2 = (1/3)/(1/4)bxy

⇒ 1.2 = (4/3)bxy

⇒ bxy = 3 × 1.2/4

∴ x और y के बीच प्रतिगमन गुणांक 0.9 है।

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