A data scientist is analyzing the relationship between website load time (seconds) and conversion rate (%). The Pearson correlation is r = -0.6. Upon inspecting the scatter plot, the analyst notices a single data point that is far from the others (e.g., a load time of 20 seconds with a high conversion rate). What is the most appropriate action?

Ignore the outlier because it is just one data point and the correlation is already strong.

Recalculate the correlation without the outlier to see if the relationship is still significant, and report both values.

Conclude that the relationship is not linear because of the outlier.

Use the median of the load times and conversion rates to calculate a new correlation.

Dell Data Science Foundations

Domain 3Objective 2

Describe and Provide Examples of the Most Important Statistical Measures and Effective Visualizations of Data DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 5)

Part of the Initial Analysis of the Data domain, which accounts for 15% of the DATA-SCIENCE-FOUNDATIONS exam.

26questions here

6free pages

5concepts

15%of the exam

Questions 21–25

21foundation · easy
A data analyst is summarizing a dataset of employee salaries. Which measure of central tendency is most appropriate when the dataset contains a few extremely high salaries that skew the distribution?
Select an answer first
22expert · hard
A data scientist is analyzing the relationship between website load time (seconds) and conversion rate (%). The Pearson correlation is r = -0.6. Upon inspecting the scatter plot, the analyst notices a single data point that is far from the others (e.g., a load time of 20 seconds with a high conversion rate). What is the most appropriate action?
Select an answer first
23foundation · easy
A manager wants to compare the distribution of sales across different regions, including median and outliers. Which visualization is most effective?
Select an answer first
24foundation · easy
Which correlation coefficient indicates the strongest linear relationship between two variables?
Select an answer first
25foundation · easy
A company wants to show the percentage of total sales contributed by each product category. Which visualization is most appropriate?
Select an answer first

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Describe and Provide Examples of the Most Important Statistical Measures and Effective Visualizations of Data DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 5)

Questions 21–25

A data analyst is summarizing a dataset of employee salaries. Which measure of central tendency is most appropriate when the dataset contains a few extremely high salaries that skew the distribution?

A manager wants to compare the distribution of sales across different regions, including median and outliers. Which visualization is most effective?

Which correlation coefficient indicates the strongest linear relationship between two variables?

A company wants to show the percentage of total sales contributed by each product category. Which visualization is most appropriate?

Keep studying — Initial Analysis of the Data