Varyans ve standart sapma

Varyans ve standart sapma, bir değişkenin yayılımını ölçmenin en yaygın iki yoludur ve bu egzersizde bunları hesaplama pratiği yapacaksın. Yayılım önemlidir çünkü beklentileri şekillendirmeye yardımcı olur. Örneğin, bir satış temsilcisi günde ortalama 20 ürün satıyorsa ve standart sapması 10 üründür, muhtemelen 40 ürün sattığı günler de olacaktır, sadece bir ya da iki ürün sattığı günler de. Bu tür bilgiler özellikle tahmin yaparken çok önemlidir.

dplyr ve ggplot2 kütüphaneleri yüklü ve food_consumption kullanılabilir durumdadır.

Bu egzersiz

R ile İstatistiğe Giriş

kursunun bir parçasıdır

Kursu Görüntüle

Uygulamalı interaktif egzersiz

Bu örnek kodu tamamlayarak bu egzersizi bitirin.

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Kodu Düzenle ve Çalıştır

Bu egzersiz

R ile İstatistiğe Giriş

kursunun bir parçasıdır

IntermediárioNível de habilidade

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Kursa Ücretsiz Başlayın

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: İstatistik nedir?Exercise 2: Betimsel ve çıkarımsal istatistik Exercise 3: Veri türü sınıflandırması Exercise 4: Merkez ölçüleri Exercise 5: Ortalama ve medyan Exercise 6: Ortalama vs. medyan Exercise 7: Yayılım ölçüleri Exercise 8: Varyans ve standart sapma

Geçerli Egzersiz

Exercise 9: Çeyrekler, kantiller ve beşlikler Exercise 10: IQR kullanarak aykırı değerleri bulma

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: What are the chances?Exercise 2: With or without replacement?Exercise 3: Calculating probabilities Exercise 4: Sampling deals Exercise 5: Discrete distributions Exercise 6: Creating a probability distribution Exercise 7: Identifying distributions Exercise 8: Expected value vs. sample mean Exercise 9: Continuous distributions Exercise 10: Which distribution?Exercise 11: Data back-ups Exercise 12: Simulating wait times Exercise 13: The binomial distribution Exercise 14: Simulating sales deals Exercise 15: Calculating binomial probabilities Exercise 16: How many sales will be won?

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!