Welke markt is beter?

De belangrijkste maatstaf die het bedrijf gebruikt om verkopers te beoordelen is het percentage verkopen boven $1000, omdat de tijd die in elke verkoop wordt gestoken meestal net iets meer waard is dan dat. Hoe hoger deze maatstaf, hoe beter de verkoper presteert.

Onthoud dat Amirs huidige verkoopbedragen een gemiddelde van $5000 en een standaardafwijking van $2000 hebben, en dat Amirs voorspelde bedragen in de markt van volgend kwartaal een gemiddelde van $6000 en een standaardafwijking van $2600 hebben.

Gebaseerd op alleen de maatstaf percentage verkopen boven $1000, presteert Amir beter in de huidige markt of in de voorspelde markt?

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Inleiding tot statistiek in R

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Inleiding tot statistiek in R

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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: 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: De normale verdeling Exercise 2: Verdeling van Amirs verkopen Exercise 3: Kansen uit de normale verdeling Exercise 4: Verkoop simuleren onder nieuwe marktomstandigheden Exercise 5: Welke markt is beter?

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Exercise 6: De centrale limietstelling Exercise 7: Steekproefverdelingen visualiseren Exercise 8: De CLT in de praktijk Exercise 9: Het gemiddelde van gemiddelden Exercise 10: De Poissonverdeling Exercise 11: Lambda herkennen Exercise 12: Reacties op leads bijhouden Exercise 13: Meer kansverdelingen Exercise 14: Te veel verdelingen Exercise 15: Tijd tussen leads modelleren Exercise 16: De t-verdeling

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!