independet t test
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Independet t - test
Manajemen DataBy Abduh Ridha
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• Uji T masuk dalam kelompok uji parametris• Uji-t dapat dibagi menjadi 2, yaitu:
a. Uji-t untuk sampel bebas (independent) b. Uji-t untuk sampel berpasangan (paired)
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• Apakah ragam populasi diasumsikan homogen (sama) atau tidak.
• Uji-t dengan ragam homogen dan tidak homogen memiliki rumus hitung yang berbeda.
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Independent T – test Homogen
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Independent T – tes tidak Homogen
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Kasus 1
• Apakah terdapat perbedaan skor ansietas antara ibu-ibu yang proses kelahirannya di dampingi suami dangan ibu-biu yang proses kelahirannya tidak didampingi suami?
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Sarat yang diperhatikan
• Hipotesis komparatif• Skala pengukuran? Numerik atau katagorik?• Sampel berpasangan atau tidak berpasangan?• Jumlah sampel 2 kelompok atau > 2
kelompok?
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Baca Kolom Levene’s Test
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• Levene’s Test untuk mengetahui homogenitas kedua kelompok
• Jika p value < 0.05 berarti tidak ada berbedaan varians antara kedua kelompok = homogen
• Jika p value > 0.05 berarti ada berbedaan varians antara kedua kelompok = tidak homogen
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Baca Kolom T - test
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• Jika homogen, baca kolom Sig. (2-tailed) pada baris Equal variances not assumed, dan
• Baca baris Equal variances assumed jika varians antar kedua kelompok terbukti tidak homogen.
• Karena p value < 0,05 maka dapat diambil kesimpulan terdapat perbedaan rerata skor ansietas kelompok ibu-ibu yang didampingi suami dan kelompok yang tidak didampingi.
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BAGAIMANA JIKA DISTRIBUSI DATA TIDAK NORMAL??
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Kasus 2
• Apakah terdapat perbedaan rerata Body Mass Index antara kelompok ekonomi rendah dan ekonomi tinggi?
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• Uji Mann Whitney merupakan uji alternatif dari uji Independent T – test, jika
• Assumsi distribusi data tidak normal
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Apa kesimpulannya?
• Karena p value > 0,05 maka tidak ada perbedaan rerata BMI kelompok ekonomi tinggi dan kelompok ekonomi rendah