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WorksheetsEDA & Data Storytelling Pre-Test
Total questions: 8
Worksheet time: 8mins
Which visualization is most suitable for understanding the distribution (shape, spread, and potential peaks) of 'MonthlyCharges' for your customers?
Bar Chart
Scatter Plot
Histogram
Pie Chart
To quickly see the proportion of customers in each 'SubscriptionType' (Basic, Standard, Premium), which technique would you use?
Calculating the mean of 'SubscriptionType'
Creating a scatter plot of 'SubscriptionType' vs. 'CustomerID'.
Generating frequency counts and proportions for 'SubscriptionType'.
Performing a correlation analysis between 'SubscriptionType' and 'MonthlyCharges'.
What is the primary goal when performing bivariate analysis on two variables in a dataset?
To summarize the distribution of a single variable.
To identify the root cause of a business problem.
To understand the relationship or association between the two variables.
To predict a future outcome based on one variable.
You want to investigate if there's a relationship between a customer's 'MonthlyCharges' and their 'TotalUsageHours'. Which visualization type is most appropriate for this task?
Bar Chart
Histogram
Pie Chart
Scatter Plot
Which of the following best describes the ultimate purpose of Data Storytelling?
To create aesthetically pleasing charts.
To present raw data in a spreadsheet format.
To communicate insights effectively to drive understanding and action.
To perform complex statistical modeling.
To make the chart easy to interpret and highlight the best-selling category, what is a key best practice you should follow?
Use 3D effects for visual appeal.
Ensure the bars are sorted by their sales value (e.g., descending).
Use at least 10 different colors for the bars.
Start the Y-axis at a value other than zero to emphasize small differences.
What is the most accurate conclusion you can draw from the observation of a strong positive correlation between the number of ice cream sales and the number of drowning incidents in a city over several months?
Buying ice cream causes people to drown.
Drowning incidents cause an increase in ice cream sales.
There is a third factor (e.g., warm weather) that likely influences both.
The correlation indicates a direct causal link between the two variables.
If a few customers are significantly older than the rest (outliers), which measure of central tendency would best represent the 'typical' age of the majority of customers?
Mean
Median
Mode
Standard Deviation
