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?