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Jawaban Latihan Soal<br />
Diket: x 1 = 18.94; s 1 = 3.90; n 1 = 45<br />
x 2 = 17.51; s 2 = 2.87; n 2 = 45<br />
α = 0.05<br />
Ditanya:Ho :µ 1<br />
− µ 2<br />
= 0<br />
H1 : µ 1<br />
− µ 2<br />
> 0<br />
Jawab:Uji satu arah, Reject Ho: T > tα<br />
T<br />
df, dibulatkan = 81<br />
t (0.05,81) = 1.664 *gunakan excel function: T.INV(α,df)*<br />
T = 1.98 > 1.664; REJECT Ho<br />
Kesimpulan: Graphlex terbukti mengefisiensikan penggunaan<br />
bbm, jadi perusahaan dapat mengiklankannya.
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