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Test di ipotesi Confronto tra medie e proporzioni

Test di ipotesi Confronto tra medie e proporzioni

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<strong>Test</strong> <strong>di</strong> <strong>ipotesi</strong> p bilaterale:<br />

confronto <strong>tra</strong> me<strong>di</strong>e<br />

<strong>Test</strong> Bilaterale<br />

Z test:<br />

Fissiamo il livello <strong>di</strong> significatività g ppari<br />

a 0.05<br />

p<br />

−<br />

= x μ<br />

z =<br />

σ n<br />

16 −16.<br />

5<br />

0 = = −<br />

2<br />

20<br />

1 1.<br />

12<br />

= P(<br />

z ≥1.<br />

12)<br />

+ P(<br />

z ≤ −1.<br />

12)<br />

= 0.<br />

13+<br />

0.<br />

13=<br />

p > 0.05 ⇒ non si rifiuta l’<strong>ipotesi</strong> nulla<br />

0.<br />

26

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