Statistika (za biologe, 2.dio) - Pmf
Statistika (za biologe, 2.dio) - Pmf
Statistika (za biologe, 2.dio) - Pmf
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Ako je X ∼ N(µ, σ 2 ), <strong>za</strong> <strong>za</strong>dane a, b ∈ R, a �= 0 vrijedi<br />
Y = aX + b ∼ N(aµ + b, a 2 σ 2 ).<br />
Npr. ako je a > 0, <strong>za</strong> proizvoljne c < d ∈ R, slijedi<br />
P (c ≤ Y ≤ d)<br />
= P (c ≤ aX + b ≤ d)<br />
c − b d − b<br />
= P ( ≤ X ≤<br />
a a )<br />
� c−b<br />
a 1<br />
=<br />
c−b σ a<br />
√ (t−µ)2<br />
e− 2σ<br />
2π 2 dt<br />
= <strong>za</strong>mijena u = at + b<br />
� d<br />
1<br />
=<br />
aσ √ (u−aµ−b)2<br />
e− 2a<br />
2π 2σ2 du<br />
c