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Pertanyaan

Dalam sebuah penelitian, diambil 20 buah sampel. Jika diketahui i = 1 ∑ n ​ x i ​ = 136 dan i = 1 ∑ n ​ x i 2 ​ = 962 , maka nilai dari S n 2 ​ adalah ....

Dalam sebuah penelitian, diambil 20 buah sampel. Jika diketahui  dan , maka nilai dari  adalah ....

  1. 6,8

  2. 2,405

  3. 1,96

  4. 1,86

  5. 0,34

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah D.

jawaban yang tepat adalah D.

Pembahasan

Ingat bahwa , maka dapat dijabarkan sebagai berikut. Dengan demikian, didapat nilai dari sama dengan 1,86. Jadi, jawaban yang tepat adalah D.

Ingat bahwa S subscript n superscript 2 equals fraction numerator sum from i equals 1 to n of open parentheses x subscript i minus x with bar on top close parentheses squared over denominator n end fraction, maka dapat dijabarkan sebagai berikut.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell S subscript n superscript 2 end cell equals cell fraction numerator sum from i equals 1 to n of open parentheses x subscript i minus x with minus on top close parentheses squared over denominator n end fraction end cell row blank equals cell fraction numerator sum from i equals 1 to n of open parentheses x subscript i superscript 2 minus 2 x subscript i x with minus on top plus open parentheses x with minus on top close parentheses squared close parentheses over denominator n end fraction end cell row blank equals cell fraction numerator sum from i equals 1 to n of x subscript i superscript 2 minus sum from i equals 1 to n of 2 x subscript i x with minus on top plus sum from i equals 1 to n of open parentheses x with minus on top close parentheses squared over denominator n end fraction end cell row blank equals cell fraction numerator sum from i equals 1 to n of x subscript i superscript 2 over denominator n end fraction minus fraction numerator sum from i equals 1 to n of 2 x subscript i x with minus on top over denominator n end fraction plus fraction numerator sum from i equals 1 to n of open parentheses x with minus on top close parentheses squared over denominator n end fraction end cell row blank equals cell fraction numerator sum from i equals 1 to n of x subscript i superscript 2 over denominator n end fraction minus fraction numerator 2 x with minus on top sum from i equals 1 to n of x subscript i over denominator n end fraction plus fraction numerator n open parentheses x with minus on top close parentheses squared over denominator n end fraction end cell row blank equals cell fraction numerator sum from i equals 1 to n of x subscript i superscript 2 over denominator n end fraction minus 2 x with minus on top times fraction numerator sum from i equals 1 to n of x subscript i over denominator n end fraction plus open parentheses x with minus on top close parentheses squared end cell row blank equals cell fraction numerator sum from i equals 1 to n of x subscript i superscript 2 over denominator n end fraction minus 2 x with minus on top times x with minus on top plus open parentheses x with minus on top close parentheses squared end cell row blank equals cell fraction numerator sum from i equals 1 to n of x subscript i superscript 2 over denominator n end fraction minus 2 open parentheses x with minus on top close parentheses squared plus open parentheses x with minus on top close parentheses squared end cell row blank equals cell fraction numerator sum from i equals 1 to n of x subscript i superscript 2 over denominator n end fraction minus open parentheses x with minus on top close parentheses squared end cell row blank equals cell fraction numerator sum from i equals 1 to n of x subscript i superscript 2 over denominator n end fraction minus open parentheses fraction numerator sum from i equals 1 to n of x subscript i over denominator n end fraction close parentheses squared end cell row blank equals cell 962 over 20 minus open parentheses 136 over 20 close parentheses squared end cell row blank equals cell 48 , 1 minus open parentheses 6 , 8 close parentheses squared end cell row blank equals cell 48 , 1 minus 46 , 24 end cell row blank equals cell 1 , 86 end cell end table end style 

Dengan demikian, didapat nilai dari S subscript n superscript 2 sama dengan 1,86.

Jadi, jawaban yang tepat adalah D.

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