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ɪɟɝɬɢ ɩɪɨɩɨɪɰɿɣɧɟ (60% ɿ 40%) ɩɪɟɞɫɬɚɜɧɢɰɬɜɨ ɨɫɿɛ ɤɨɠɧɨʀ ɫɬɚɬɿ. ɍ ɪɚɡɿ ɩɪɨ-
ɫɬɨʀ (ɚɛɨ ɫɢɫɬɟɦɚɬɢɱɧɨʀ) ɪɚɧɞɨɦɿɡɨɜɚɧɨʀ ɜɢɛɿɪɤɢ ɹɤɿɫɧɟ ɿ ɤɿɥɶɤɿɫɧɟ ɫɩɿɜɜɿɞɧɨ-
ɲɟɧɧɹ ɨɫɿɛ ɦɨɠɟ ɛɭɬɢ ɧɟɚɞɟɤɜɚɬɧɢɦ ɞɨ ɝɟɧɟɪɚɥɶɧɨʀ ɫɭɤɭɩɧɨɫɬɿ. ȼɢɤɨɪɢɫɬɚɧ-
ɧɹ ɫɬɪɚɬɢɮɿɤɨɜɚɧɨʀ ɜɢɛɿɪɤɢ ɨɛɦɟɠɟɧɨ ɬɢɦ, ɳɨ ɞɨɫɢɬɶ ɱɚɫɬɨ ɫɤɥɚɞ ɝɟɧɟɪɚɥɶɧɨʀ
ɫɭɤɭɩɧɨɫɬɿ ɳɨɞɨ ɨɫɧɨɜɧɢɯ ɩɿɞɝɪɭɩ ɡɚɥɢɲɚɽɬɶɫɹ ɧɟɜɿɞɨɦɢɦ.
Ʉɥɚɫɬɟɪɧɚ ɜɢɛɿɪɤɚ ɡɞɚɬɧɚ ɜɢɪɿɲɭɜɚɬɢ ɩɪɨɛɥɟɦɭ ɧɟɩɨɜɧɨɬɢ ɫɤɥɚɞɭ ɩɿɞɝɪɭɩ
ɮɨɪɦɭɜɚɧɧɹ. Ʉɥɚɫɬɟɪɧɢɣ ɦɟɬɨɞ ɩɟɪɟɞɛɚɱɚɽ ɩɨɟɬɚɩɧɢɣ ɜɢɛɿɪ ɝɪɭɩ (ɤɥɚɫɬɟɪɿɜ), ɚ
ɧɟ ɨɤɪɟɦɢɯ ɟɥɟɦɟɧɬɿɜ. ɇɚɩɪɢɤɥɚɞ, ɧɚ ɩɟɪɲɨɦɭ ɟɬɚɩɿ ɨɬɪɢɦɚɧɧɹ ɪɟɩɪɟɡɟɧɬɚɬɢ-
ɜɧɨʀ ɜɢɛɿɪɤɢ ɫɬɭɞɟɧɬɿɜ ɦɨɠɟ ɜɢɤɨɧɭɜɚɬɢɫɹ ɮɨɪɦɭɜɚɧɧɹ ɫɩɢɫɤɭ ɛɚɡɨɜɢɯ ɧɚ-
ɜɱɚɥɶɧɢɯ ɞɢɫɰɢɩɥɿɧ. Ɍɨɞɿ ɝɪɭɩɨɸ ɦɨɠɟ ɛɭɬɢ ɫɩɢɫɨɤ ɫɬɭɞɟɧɬɿɜ ɪɿɡɧɢɯ ɫɩɟɰɿɚ-
ɥɶɧɨɫɬɟɣ, ɳɨ ɜɿɞɜɿɞɭɸɬɶ ɡɚɧɹɬɬɹ ɡ ɩɟɜɧɨɝɨ ɧɚɜɱɚɥɶɧɨɝɨ ɩɪɟɞɦɟɬɚ. əɤɳɨ
ɫɩɢ-
ɫɨɤ ɞɢɫɰɢɩɥɿɧ ɞɨɫɬɚɬɧɶɨ ɜɟɥɢɤɢɣ (30-40 ɝɪɭɩ), ɦɨɠɧɚ ɜɢɩɚɞɤɨɜɢɦ ɦɟɬɨɞɨɦ
ɜɿɞɿɛɪɚɬɢ 8-10 ɬɚɤɢɯ ɝɪɭɩ. əɤɳɨ ɝɪɭɩɢ ɧɟɱɢɫɥɟɧɧɿ, ɦɨɠɧɚ ɞɨɫɥɿɞɠɭɜɚɬɢ ɜɫɿɯ
ɫɬɭɞɟɧɬɿɜ, ɹɤɳɨ ɧɿ – ɦɨɠɧɚ ɫɮɨɪɦɭɜɚɬɢ ɛɿɥɶɲ ɞɪɿɛɧɿ ɪɚɧɞɨɦɿɡɨɜɚɧɿ ɜɢɛɿɪɤɢ.
ɋɬɭɩɿɧɶ ɿ ɝɥɢɛɢɧɚ ɪɨɡɝɚɥɭɠɟɧɧɹ (ɤɿɥɶɤɿɫɬɶ ɟɬɚɩɿɜ ɝɪɭɩɭɜɚɧɧɹ) ɜɢɡɧɚɱɚɽɬɶɫɹ
ɦɟɬɨɸ ɬɚ ɭɦɨɜɚɦɢ ɞɨɫɥɿɞɠɟɧɧɹ. Ʉɥɚɫɬɟɪɧɿ ɜɢɛɿɪɤɢ ɦɟɧɲ ɧɚɞɿɣɧɿ, ɧɿɠ ɿɦɨɜɿɪ-
ɧɿɫɧɿ ɿɡ-ɡɿ ɧɚɹɜɧɨɫɬɿ ɞɟɤɿɥɶɤɨɯ
ɟɬɚɩɿɜ ɜɿɞɛɨɪɭ, ɤɨɠɧɢɣ ɡ ɹɤɢɯ ɞɨɞɚɽ ɫɜɨɸ ɩɨ-
ɯɢɛɤɭ. ɍ ɪɚɡɿ ɠ ɪɚɧɞɨɦɿɡɨɜɚɧɨʀ ɜɢɛɿɪɤɢ ɞɨɫɥɿɞɧɢɤ ɪɢɡɢɤɭɽ ɥɢɲɟ ɨɞɢɧ ɪɚɡ. Ɍɨ-
ɦɭ ɦɚɬɟɦɚɬɢɱɧɚ ɬɟɨɪɿɹ ɜɢɛɿɪɤɨɜɨɝɨ ɦɟɬɨɞɭ ɡɞɟɛɿɥɶɲɨɝɨ ɛɚɡɭɽɬɶɫɹ ɧɚ ɚɧɚɥɿɡɿ
ɜɥɚɫɧɨ ɿɦɨɜɿɪɧɿɫɧɨʀ ɜɢɛɿɪɤɢ.
Ɍɟɨɪɟɬɢɱɧɭ ɨɫɧɨɜɭ ɨɰɿɧɸɜɚɧɧɹ ɡ ɜɢɤɨɪɢɫɬɚɧɧɹɦ ɜɢɛɿɪɤɨɜɨɝɨ ɦɟɬɨɞɭ
ɫɤɥɚɞɚɽ
ɡɚɤɨɧ ɜɟɥɢɤɢɯ ɱɢɫɟɥ, ɡɝɿɞɧɨ ɡ ɹɤɢɦ ɩɪɢ ɧɟɨɛɦɟɠɟɧɨɦɭ ɡɛɿɥɶɲɟɧɿ ɨɛ-
ɫɹɝɭ ɜɢɛɿɪɤɢ ɜɢɩɚɞɤɨɜɿ ɯɚɪɚɤɬɟɪɢɫɬɢɤɢ ɜɢɛɿɪɤɢ ɧɚɛɥɢɠɚɸɬɶɫɹ (ɫɯɨɞɹɬɶɫɹ ɡɚ
ɣɦɨɜɿɪɧɿɫɬɸ) ɞɨ ɩɟɜɧɢɯ ɩɚɪɚɦɟɬɪɿɜ ɝɟɧɟɪɚɥɶɧɨʀ ɫɭɤɭɩɧɨɫɬɿ (ɞɢɜ. ɪɨɡɞɿɥ 3.3)..
ɇɚɩɪɢɤɥɚɞ, ɞɥɹ ɫɤɿɧɱɟɧɧɨʀ ɝɟɧɟɪɚɥɶɧɨʀ ɫɭɤɭɩɧɨɫɬɿ ɜɢɛɿɪɤɨɜɟ ɫɟɪɟɞɧɽ
X
ɿ
ɞɢɫɩɟɪɫɿɹ
s
x
2
ɧɚɛɥɢɠɚɸɬɶɫɹ ɞɨ ɫɜɨʀɯ ɝɟɧɟɪɚɥɶɧɢɯ ɩɨɤɚɡɧɢɤɿɜ (ɫɟɪɟɞɧɶɨɝɨ ȝ ɿ
ɞɢɫɩɟɪɫɿʀ
ı
2
ɜɿɞɩɨɜɿɞɧɨ). ɍ ɪɚɡɿ ɧɟɫɤɿɧɱɟɧɧɨʀ ɝɟɧɟɪɚɥɶɧɨʀ ɫɭɤɭɩɧɨɫɬɿ (N = )
ɡɚɦɿɫɬɶ ɫɟɪɟɞɧɶɨɝɨ
ȝ ɿ ɞɢɫɩɟɪɫɿʀ ı
2
ɦɚɽɬɶɫɹ ɧɚ ɭɜɚɡɿ ɦɚɬɟɦɚɬɢɱɧɟ ɫɩɨɞɿɜɚɧɧɹ
M[X] ɿ ɞɢɫɩɟɪɫɿɹ D[X] ɪɨɡɩɨɞɿɥɭ ɞɨɫɥɿɞɠɭɜɚɧɨʀ ɜɢɩɚɞɤɨɜɨʀ ɜɟɥɢɱɢɧɢ ɏ.
Ɉɬɠɟ, ɝɟɧɟɪɚɥɶɧɚ ɫɭɤɭɩɧɿɫɬɶ (ɨɛɫɹɝ
N) ɿ ɜɢɛɿɪɤɚ (ɨɛɫɹɝ n) ɦɨɠɭɬɶ ɯɚɪɚɤ-