Sampling transaksi

Pada latihan sebelumnya, Anda menghitung jumlah transaksi yang dikerjakan Amir. Sekarang saatnya memilih lima transaksi secara acak agar Anda dapat menghubungi masing-masing pelanggan dan menanyakan apakah mereka puas dengan layanan yang diterima. Anda akan mencoba melakukannya baik dengan maupun tanpa pengembalian (replacement).

Selain itu, Anda ingin memastikan pemilihan ini benar-benar acak dan dapat direproduksi jika Anda ditanya bagaimana cara Anda memilih transaksi tersebut, jadi Anda perlu menetapkan random seed sebelum melakukan sampling dari transaksi.

dplyr sudah dimuat dan amir_deals tersedia.

Latihan ini adalah bagian dari kursus

Pengantar Statistika di R

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

# Set random seed to 31
___

# Sample 5 deals without replacement
amir_deals %>%
  ___

Edit dan Jalankan Kode

Latihan ini adalah bagian dari kursus

Pengantar Statistika di R

SkillTag.level.intermediateSkillTag.label

4.8+

Mulai Kursus Gratis

Summary statistics gives you the tools you need to boil down massive datasets to reveal the highlights. In this chapter, you'll explore summary statistics including mean, median, and standard deviation, and learn how to accurately interpret them. You'll also develop your critical thinking skills, allowing you to choose the best summary statistics for your data.

Exercise 1: What is statistics?Exercise 2: Descriptive and inferential statistics Exercise 3: Data type classification Exercise 4: Measures of center Exercise 5: Mean and median Exercise 6: Mean vs. median Exercise 7: Measures of spread Exercise 8: Variance and standard deviation Exercise 9: Quartiles, quantiles, and quintiles Exercise 10: Finding outliers using IQR

In this chapter, you'll learn how to generate random samples and measure chance using probability. You'll work with real-world sales data to calculate the probability of a salesperson being successful. Finally, you’ll use the binomial distribution to model events with binary outcomes.

Exercise 1: Seberapa besar kemungkinan?Exercise 2: Dengan atau tanpa pengembalian?Exercise 3: Menghitung probabilitas Exercise 4: Sampling transaksi

Latihan Saat Ini

Exercise 5: Distribusi diskret Exercise 6: Membuat sebaran probabilitas Exercise 7: Mengidentifikasi distribusi Exercise 8: Nilai harapan vs. mean sampel Exercise 9: Distribusi kontinu Exercise 10: Distribusi yang mana?Exercise 11: Pencadangan data Exercise 12: Mensimulasikan waktu tunggu Exercise 13: Distribusi binomial Exercise 14: Mensimulasikan kesepakatan penjualan Exercise 15: Menghitung probabilitas binomial Exercise 16: Berapa banyak penjualan yang akan dimenangkan?

It’s time to explore one of the most important probability distributions in statistics, normal distribution. You’ll create histograms to plot normal distributions and gain an understanding of the central limit theorem, before expanding your knowledge of statistical functions by adding the Poisson, exponential, and t-distributions to your repertoire.

Exercise 1: The normal distribution Exercise 2: Distribution of Amir's sales Exercise 3: Probabilities from the normal distribution Exercise 4: Simulating sales under new market conditions Exercise 5: Which market is better?Exercise 6: The central limit theorem Exercise 7: Visualizing sampling distributions Exercise 8: The CLT in action Exercise 9: The mean of means Exercise 10: The Poisson distribution Exercise 11: Identifying lambda Exercise 12: Tracking lead responses Exercise 13: More probability distributions Exercise 14: Too many distributions Exercise 15: Modeling time between leads Exercise 16: The t-distribution

In this chapter, you'll learn how to quantify the strength of a linear relationship between two variables, and explore how confounding variables can affect the relationship between two other variables. You'll also see how a study’s design can influence its results, change how the data should be analyzed, and potentially affect the reliability of your conclusions.

Exercise 1: Correlation Exercise 2: Guess the correlation Exercise 3: Relationships between variables Exercise 4: Correlation caveats Exercise 5: What can't correlation measure?Exercise 6: Transforming variables Exercise 7: Does sugar improve happiness?Exercise 8: Confounders Exercise 9: Design of experiments Exercise 10: Study types Exercise 11: Longitudinal vs. cross-sectional studies Exercise 12: Congratulations!