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Practice Data Analytics Languages Questions and Answers

Which storage method is most suitable for managing large-scale unstructured data like videos or social media posts?
A data analyst is tasked with evaluating customer feedback from a population of 1,000,000 survey responses. Why is sampling an essential technique in this ...
Which of the following is an example of non-random sampling?
A company divides its employees into departments (e.g., HR, IT, Marketing) and then selects random samples from each department for a satisfaction survey. ...
How can selection bias be minimized in a survey of employee job satisfaction?
What factor is the most critical when determining the appropriate sample size for a study?
If a dataset has a mean significantly higher than the median, which of the following is most likely true?
Which visualization tool is best suited for creating interactive dashboards with advanced business intelligence capabilities?
A scatter plot reveals a strong positive linear relationship between two variables. Which of the following is the most appropriate statistical measure to c...
In hypothesis testing, which of the following best describes the p-value?
A study estimates the average weight of a population with a 95% confidence interval of (65 kg, 75 kg). What does this mean?
A company notices an increase in sales every December due to holiday shopping. Which component of time series data does this represent?
Which of the following forecasting methods is most suitable for data with a linear trend but no seasonality?
In time series decomposition, which component is removed to achieve stationarity?
Which test is commonly used to check stationarity in time series data?
Which of the following scenarios demonstrates an appropriate application of time series analysis?
You have a dataset with sales data for multiple regions and months. You want to calculate the total sales per region and then filter the regions with total...
Given the following tables: Orders (OrderID, CustomerID, OrderDate) and Customers (CustomerID, CustomerName, City), what SQL query will return the names of...
Which Python library is most commonly used to calculate the correlation matrix of a dataset in preparation for predictive modeling?
In R, which function is used to perform a t-test for comparing the means of two independent samples?
In Power BI, which of the following is the best way to create an interactive report with multiple filters and dynamic charts?
Which of the following best defines the role of a data analyst in an organization?
You are analyzing sales data and notice missing values in some of the records. What is the most appropriate first step to take during the data analysis pro...
You are working on a customer churn analysis project. Your objective is to predict which customers are likely to leave the service in the next quarter. Whi...
You have a dataset with inconsistent date formats (e.g., 'DD/MM/YYYY', 'MM-DD-YYYY', 'YYYY-MM-DD'). What is the first step you should take to standardize t...
Which of the following is the best approach for presenting data-driven insights to a non-technical audience?
Which of the following is an example of continuous data?
Which of the following best represents semi-structured data?
Which of the following is a key difference between Big Data and Traditional Data?
Which of the following is an example of metadata in a database?
When performing data normalization, what is the primary purpose?
Why is sampling often preferred over using the entire population for data analysis?
Which of the following best describes non-random sampling?
Which of the following factors is most crucial when determining the appropriate sample size for a data analysis study?
What is the primary advantage of using a box plot for data visualization?
Which of the following statements best describes the purpose of a p-value in hypothesis testing?
In forecasting, which method is most appropriate when the time series data exhibits both trend and seasonality?
What does the Dickey-Fuller test primarily assess in a time series dataset?
Which of the following is a major advantage of using Power BI over traditional Excel charts for data visualization?
Which of the following is a distinguishing feature of Tableau when compared to Power BI?

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