CompTIA Updated DA0-001 Exam Questions and Answers by zak

For an employer looking to maintain adequate office staffing during winter while tracking storm data, the most effective method would be to use public databases. These databases often contain comprehensive records of weather patterns and storm data collected and verified by reputable meteorological organizations. Utilizing public databases allows for access to historical and real-time data that is crucial for making informed decisions about staffing during adverse weather conditions.

Web scraping (A) is not the most reliable method, as it may involve extracting data from various websites that might not always provide verified or consistent information. Observations © can be subjective and may not cover a wide enough area to be effective for decision-making on a larger scale. Weather surveys (D) could provide insights, but they are not as immediate or comprehensive as the data available in public databases.

References:

• The systematic review on Big Data Analytics in Weather Forecasting suggests that big data techniques and technologies can manage and analyze the huge volume of weather data from different resources, which supports the use of public databases1.
• NOAA’s approach to detecting severe weather events using instruments and receiving information from storm spotters indicates the importance of reliable, collected data, which is typically stored in public databases2.
• The National Weather Service’s use of observational data collected by various instruments, which are then fed into forecast models, further emphasizes the value of established data collection methods over individual observations or surveys3.

The SQL query provided is selecting all records from the Cust_table where the age column has values greater than 60 and the City column matches “New York”. The > operator selects values that are strictly greater than the comparison value, so it does not include customers aged exactly 60. The term “New York” in the context of a city database typically refers to New York City, not the state of New York. Therefore, the correct answer is that the analyst is retrieving data for all customers older than age 60 in New York City.

References:

• The use of the > operator in SQL is to select values greater than the specified value1.
• Understanding the WHERE clause in SQL and its use in filtering records based on specified conditions2.
• Clarification on the distinction between city and state names in database records3.

Explanation

Data encryption can be used to translate data into another form so it can only be read by a user who has a key or a password. Data encryption is a process of transforming data using an algorithm or a cipher to make it unreadable to anyone except those who have the key or the password to decrypt it. Data encryption is a common method of protecting data from unauthorized access, modification, or theft. Reference: Guide to CompTIA Data+ and Practice Questions - Pass Your Cert

When an analyst observes changes in sales ratios over a period, such as in a quarterly report, they are conducting a trend analysis. Trend analysis is a statistical method used to examine and evaluate the movement of data points over time to identify patterns or trends. This type of analysis is particularly useful for forecasting future events based on historical data. It differs from gap analysis, which assesses the difference between actual performance and potential or desired performance; link analysis, which is used to find associations among data; and statistical analysis, which is a broad term for all types of data analysis methods, including trend analysis.

References:

• Investopedia article on Ratio Analysis1.
• SpringerLink chapter on Financial Ratios Analysis2.
• ExamTopics page mentioning sales ratios in the context of analysis3.
• Investopedia definition of Ratio Analysis4.
• LiveWell article on Financial Ratio Analysis5.