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# Population+Sample

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Population and Sample on Statistic

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### Population+Sample

1. 1. 4 March 2010 Tugas Penelitian Kualitatif: 1 Population+Sample
2. 2. Population is complete actual/theoretical collection of numerical values (scores) that are of interest to the researcher. Simbol = N (hurup besar) Keseluruhan objek yang diteliti, baik orang,benda, kejadian,nilai maupun yang hal-hal yang diselidiki. 4 March 2010 Tugas Penelitian Kualitatif: 2 Population+Sample
3. 3. Sample is a subset of population. Or a set of observed scores from which the inferences of the population is made. Simbol = n (hurup kecil) Bagian dari populasi yang akan diselidiki. 4 March 2010 Tugas Penelitian Kualitatif: 3 Population+Sample
4. 4. Population Sample • a population is the group • A sample is a set of data of all items of interest to a drawn from the population. statistics practitioner. • Potentially very large, but • frequently very large; less than the population. sometimes infinite. • E.g. a sample of 765 • E.g. All 5 million Jakarta voters exit polled on voters. election day 4 March 2010 Tugas Penelitian Kualitatif: 1.4 Population+Sample
5. 5. Population Sample Subset Statistic Parameter • Populations have Parameters, • Samples have Statistics. 4 March 2010 Tugas Penelitian Kualitatif: 1.5 Population+Sample
6. 6. • Statistical inference (Dugaan Statistik) is the process of making an estimate, prediction, or decision about a population based on a sample. Population Sample Inference Statistic Parameter What can we infer about a Population’s Parameters based on a Sample’s Statistics? 4 March 2010 Tugas Penelitian Kualitatif: 6 Population+Sample
7. 7. Contoh: Difference between • Populasi: Seluruh population and • Judul penelitian mahasiswa UPI sample: “Keterlambatan (40.000 • sample is part of population and its Penyelesaian mahasiswa) function is to draw the Studi di • Sample : 0,1% dari most accurate possible kalangan populasi (400 picture of population mahasiswa) from the limited data of mahasiswa the sample. UPI”. • Population consists of all possible data. 4 March 2010 Tugas Penelitian Kualitatif: 7 Population+Sample
8. 8. 1. Size of 3. Error 2. For 4. If we 5. Probability sample is always exists descriptive increase the of error important to when we statistics, sample size, always exists make take the size is not the error will in statistical statistical sample from important. decrease influence. influence. population. 4 March 2010 Tugas Penelitian Kualitatif: 8 Population+Sample
9. 9. Menurut Sutrisno Hadi, tidak ada suatu ketepatan yang mutlak berapa persen suatu sample harus diambil dari populasi. Beberapa faktor yang membuat peneliti mengambil sample: (1) Biaya (2) tenaga (3) Waktu 4 March 2010 Tugas Penelitian Kualitatif: 9 Population+Sample
10. 10. • Sampling adalah cara yang digunakan untuk mengambil sample dan biasanya mengikuti teknik atau jenis tertentu. 1 Misalnya random sampling atau non-random sampling. • Random sampling: • each member of population has an equal chance of being 2 selected as sample. • Without randomization the result of data analysis is meaningless. 3 4 March 2010 Tugas Penelitian Kualitatif: 10 Population+Sample
11. 11. Why is sample size important? To make statistical inferences. The bigger the sample size, the more accurate the conclusion. 4 March 2010 Tugas Penelitian Kualitatif: 11 Population+Sample
12. 12. Kesalahan sampling Kesalahan spesifikasi teori Kesalahan Kesalahan pengukuran / random measurement 4 March 2010 Tugas Penelitian Kualitatif: 12 Population+Sample