Here you have the best CompTIA DA0-001 practice exam questions
A data analyst needs to calculate the mean for Q1 sales using the data set below:
Which of the following is the mean?
The mean for Q1 sales can be calculated by summing the sales figures for each product and then dividing by the number of products. The sales figures are: $2,667.60, $1,768.41, $3,182.40, $1,509.60, and $3,202.87. The sum of these values is $12,330.88. Dividing this sum by the number of products (5) gives a mean of $2,466.18. Therefore, the correct answer is $2,466.18.
A data analyst is creating a report that will provide information about various regions, products, and time periods. Which of the following formats would be the MOST efficient way to deliver this report?
A dashboard with filters at the top that the user can toggle would be the most efficient way to deliver this report. This format allows users to dynamically interact with the data by filtering different regions, products, and time periods without the need to navigate through multiple tabs or pages. This interactivity and flexibility make dashboards highly efficient for accessing and comparing data in real-time, improving the user experience and effectiveness of the report.
A customer list from a financial services company is shown below:
A data analyst wants to create a likely-to-buy score on a scale from 0 to 100, based on an average of the three numerical variables: number of credit cards, age, and income. Which of the following should the analyst do to the variables to ensure they all have the same weight in the score calculation?
To ensure that all three variables (number of credit cards, age, and income) have the same weight in the score calculation, the analyst should normalize the variables. Normalization scales the variables to a common range, typically between 0 and 1, by subtracting the minimum value and dividing by the range (maximum value minus minimum value). This makes it possible to directly compare and average the variables without one disproportionately influencing the score due to its scale or range. Recoding, calculating percentiles, or determining standard deviations do not inherently ensure equal weighting in the final score calculation.
Which of the following actions should be taken when transmitting data to mitigate the chance of a data leak occurring? (Choose two.)
To mitigate the chance of a data leak occurring during transmission, two important actions are data encryption and data masking. Data encryption involves converting the data into a coded format that can only be accessed by authorized parties with the correct decryption key. This ensures that the data remains confidential and secure even if intercepted. Data masking involves replacing sensitive data with non-sensitive substitutes, making it unusable for unauthorized purposes while maintaining its utility for testing or development. Together, these methods protect the data both in transit and at rest, significantly reducing the risk of a data leak.
A data analyst has been asked to organize the table below in the following ways:
By sales from high to low -
By state in alphabetic order -
Which of the following functions will allow the data analyst to organize the table in this manner?
To arrange the table by sales from high to low and then by state in alphabetical order, the correct function to use is sorting. Sorting allows for data to be organized based on the values in one or more columns. By applying a sort function, the table can first be sorted by the sales column in descending order and then by the state column in alphabetical order, achieving the desired organization.