DA0-001 practice questions 121–130

1. Question 121 · 365 in bank

   An analyst needs to provide a chart to identify the composition between the categories of the survey response data set:

   

   Which of the following charts would be BEST to use?

   • AHistogram
   • BPie
   • CLine
   • DScatter pot
   • EWaterfall

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   Answer: B

   Explanation

   B. A pie chart would be the best chart to use to identify the composition between the categories of the survey response data set. A pie chart is a circular chart that shows the proportions or percentages of a whole. Each slice of the pie represents a category, and the size of the slice represents the proportion or percentage of the total that belongs to that category. Pie charts are useful for showing the relative sizes of categories or for comparing the proportions of different categories. The other chart types (histogram, line, scatter plot, and waterfall) are not appropriate for showing the composition between categories.

   Source: Adapted from community discussion — CineFeX

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2. Question 122 · 365 in bank

   A data analyst reviews the following data set:

   

   Which of the following is the range value?

   • A9
   • B10
   • C12
   • D13

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   Answer: D

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3. Question 123 · 365 in bank

   An analyst collected data that includes primary account numbers, expiration dates, and service codes. Which of the following data governance classifications is used to describe this data?

   • APII
   • BPCI
   • CPBI
   • DPHI

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   Answer: B

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4. Question 124 · 365 in bank

   Five dogs have the following heights in millimeters: 300, 430, 170, 470, 600 Which of the following is the mean height for the five dogs?

   • A394mm
   • B405mm
   • C493mm
   • D504mm

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   Answer: A

   Explanation

   The mean height for the five dogs is 394mm. To calculate the mean, the heights of all the dogs are added together and then divided by the number of dogs. In this case, the heights of the five dogs are 300mm, 430mm, 170mm, 470mm, and 600mm, for a total of 1,970mm. When this total is divided by 5 (the number of dogs), the mean height is calculated to be 394mm.

   Source: Adapted from community discussion — rizalrejab

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5. Question 125 · 365 in bank

   A data analyst received a large amount of third-party data that needs to be joined with in-house data files. After the data is joined, the analyst notices three columns all contain dates. Which of the following should the analyst do to maintain data consistency?

   • AAppend all date columns and parse the strings.
   • BImpute all three date columns and then merge.
   • CMerge all date columns and unify the format.
   • DSeparate the columns into a table and merge.

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   Answer: C

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6. Question 126 · 365 in bank

   A data analyst needs to apply quality control concepts to a data set for accuracy. Which of the following is the best way to do this?

   • AStandardization
   • BParameterization
   • CEncryption
   • DCross-validation

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   Answer: A

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7. Question 127 · 365 in bank

   Select 2

   Which of the following are reasons to create and maintain a data dictionary? (Choose two.)

   • ATo improve data acquisition
   • BTo remember specifics about data fields
   • CTo specify user groups for databases
   • DTo provide continuity through personnel turnover
   • ETo confine breaches of PHI data
   • FTo reduce processing power requirements

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   Answer: AD

   Explanation

   A. To improve data acquisition D. To provide continuity through personnel turnover A data dictionary is a critical component of data management, and its creation and maintenance are important for several reasons. A. To improve data acquisition: A data dictionary helps in improving data acquisition by providing clear definitions and descriptions of data elements, allowing for more accurate and consistent data collection. It also helps to eliminate duplicates and improve data quality by providing a clear understanding of what data is stored and where. D. To provide continuity through personnel turnover: As personnel change within an organization, the data dictionary provides continuity and helps to ensure that data remains consistently defined and described. This helps to minimize the impact of personnel changes on data quality and consistency, allowing for seamless transitions in data management.

   Source: Adapted from community discussion — ronniehaang

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8. Question 128 · 365 in bank

   Given the following table:

   

   Which of the following methods is the best way to describe the changes in the values in the table?

   • AAverage
   • BRange
   • CStandard deviation
   • DMedian

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   Answer: C

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9. Question 129 · 365 in bank

   A data analyst needs to create a dashboard to help identify trends in the data sets. Which of the following is an appropriate consideration for dashboard development?

   • AData sources and attributes
   • BFrequently asked questions
   • CA report from the data source
   • DA comparison of data sets

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   Answer: A

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10. Question 130 · 365 in bank

    A recurring event is being stored in two databases that are housed in different geographical locations. A data analyst notices the event is being logged three hours earlier in one database than in the other database. Which of the following is the MOST likely cause of the issue?

    • AThe data analyst is not querying the databases correctly.
    • BThe databases are recording different events.
    • CThe databases are recording the event in different time zones.
    • DThe second database is logging incorrectly.

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    Answer: C

    Explanation

    C. The databases are recording the event in different time zones. The most likely cause of the issue is that the databases are recording the event in different time zones. If the databases are housed in different geographical locations, it is possible that one database may be in a time zone that is three hours ahead of the other. This could result in the event being logged three hours earlier in one database than in the other. It is important to consider time zones when working with databases that are housed in different geographical locations to ensure accurate logging of events.

    Source: Adapted from community discussion — ronniehaang

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DA0-001 practice, question 121. 365 questions available.