Contoh Laporan Praktikum Biologi Perikanan Tentang Mortalitas dan Pendugaan Populasi Jurusan Budidaya Perairan Fakultas Perikanan dan Ilmu Kelautan Universitas RiauFull description
ze a m a y s_hib hibrrid ida a @y a ho hoo o .c o m
FAKULTAS PERTANIAN UNIVERSITAS SWADAYA GUNUNG JATI CIREBON 2009
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IV. PENDUGAAN PARAMETER Populasi
Sampel Sampling
N
Rata-rata : μ
n
Rata-rata : x
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IV. PENDUGAAN PARAMETER 1. Parameter = sembarang nilai yang menjelaskan ciri populasi 2. Statistik = sembarang nilai yang menjelaskan ciri sampel Misalkan populasi tanaman padi kultivar IR-64 pada luasan 1 hektar dengan jarak tanam 20 cm x 20 cm yaitu sebanyak 250.000 tanaman, diambil sebuah sampel secara acak berukuran n = 500 tanaman dan diperoleh rata-rata jumlah anakannya 15 anakan.
Ukuran Populasi N = 250.000
Ukur uraan Sampel n = 500,
Rata-rata x = 15
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IV. PENDUGAAN PARAMETER Nilai dugaan dalam bentuk selang lebih tepat digunakan daripada nilai dugaan dalam bentuk dugaan titik. Nilai dugaan selang : P (a < θ < b ) = 1 – α, artinya peluang θ terletak diantara a dan b sebesar (1 – α). Atau kita yakin sebesar (1 – α) 100% bahwa θ ada dalam selang (a (a,b). Selang : (a (a < θ < b ) disebut Selang Kepercayaan (1 – α) 100%.
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IV. PENDUGAAN PARAMETER Jika nilai
α=5%
maka (1 – α ) = 95 % = 0,95.
a
x SE
a = x – SE
b SE a = x – SE
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1. PENDUGAAN RATA-RATA Penggunaan Sebaran t dan z Apa σ ada?
Ya
Uji - z
Tidak n ≥ 30 ?
Ya
Uji - z
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A. Pendugaan Rata-rata Satu Sampel
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A. Pendugaan Rata-rata Satu Sampel Contoh 1 : Suatu contoh acak 36 mhs tingkat akhir mempunyai IP rata–rata 2,60 dan simpangan baku 0,30. Buatlah selang kepercayaan 95% bagi rata–rata IP seluruh mhs tingkat akhir akhir tersebut.
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A. Pendugaan Rata-rata Satu Sampel Contoh 2 : Sebuah lembaga penelitian menghasilkan kedelai Kultivar X. Dari hasil percobaan di 16 lokasi diperoleh rata-rata hasilnya 1,15 t/ha dengan simp. baku 0,20 t/ha. Buatlah selang kepercayaan 95% bagi rata-rata hasil yang sebenarnya.
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B. Pendugaan Rata-rata Dua Sampel ( x1– x2 ) – tα/2(n1+n2-2).SE < (μ1– μ2) < (x1– x2) + tα/2(n1+n2-2).SE Menghitung SE : 1. Jika Ragam Kedua Sampel Sama ( σ
2=σ 2):
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B. Pendugaan Rata-rata Dua Sampel Contoh : Pelajaran matematika diberikan kepada 12 siswa kelas A dengan Metode Biasa, dan 10 siswa kelas B dengan Metode Terprogram. Hasil ujian kelas A rata–ratanya 85 dengan simpangan baku 4, kelas B rata–ratanya rata–ratanya 81 dengan dengan simpangan baku 5. Tentukan
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