WGU D467 EXPLORING DATA OBJECTIVE ASSESSMENT ACTUAL EXAM 2025/2026 QUESTIONS WITH VERIFIED CORRECT SOLUTIONS || 100% GUARANTEED PASS <BRAND NEW VERSION>

WGU D467 EXPLORING DATA OBJECTIVE ASSESSMENT ACTUAL EXAM 2025/2026 QUESTIONS WITH VERIFIED CORRECT SOLUTIONS || 100% GUARANTEED PASS &lt;BRAND NEW VERSION&gt; 1. BigQuery - ANSWER A Data warehouse on Google Cloud used to query, filter large datasets, aggregate results, and perform complete operations. 2. Vertica - ANSWER Case Sensitive, returning true value of input 3. General Rule Regarding Suggested Length of each line in query to maintain indentation best practices - ANSWER Less than or equal to 100 characters 4. Foldering - ANSWER Process that utilities logical and descriptive names for files, making them easier to find and use 5. Data Security - ANSWER Limits access to data by enabling safety feature. Data analysts must find a way to balance data security with the needs of the analysis 6. Data Compromise - ANSWER Data be can compromised every time it is replicated, transferred, or manipulated in any way 7. Data manipulation - ANSWER The Process of changing the date 8. Data compromise - ANSWER Can only be compromised through human error, viruses, malware, hacking, and system failures 9. Sample Size - ANSWER Using part of the population that is representative of the population 10.Population - ANSWER Entire group that you are interested in your study 11.Sample - ANSWER Subset of population, do not use less than 30 12.Confidence Level - ANSWER Targeted before you start your study, it will affect your margin of error at end of study. Mostly used is 95% but 90% will work. 13.Proxy Data - ANSWER Used when data to support a business objective is not available 14.Sample Size Calculator - ANSWER Tells you how many people you need to interview to get results that represents the target population. 15.Calculating Margin of Error - ANSWER Requires population Size, Confidence Level, Sample Size 16.Dirty data - ANSWER Incomplete, incorrect, or irrelevant to the problem trying to be solved. 17.Clean Data - ANSWER Complete, Correct, and relevant to the problem you are trying to be solve 18.Spreadsheet Applications - ANSWER Cleaning tools such as conditional formatting, removing duplicates, formatting dates, splitting text to columns 19.CONCATENATE - ANSWER Function that joins together two or more text strings 20.Data Cleaning - ANSWER the process of checking data for errors after the data have been entered in a computer file 21.SQL Function: CAST - ANSWER Used to typecast text strings into floats and convert anything from one data type to another. It can also be used to change strings into other data types like time and date 22.SQL Function: COALESCE - ANSWER Used to return non-null values in a list. 23.SQL FUNCTION: UPDATE - ANSWER Modifies values in certain cells of a table based on conditions case - ANSWER camelCase, first letter of second word is capitalized 25.Which of the following are examples of sampling bias? Select all that apply. A teacher gives higher grades to essays written in their own writing style. A clinical study includes three times more men than women. A survey of students does not include homeschooled students. An election poll only interviews people with college degrees. - ANSWER A clinical study includes three times more men than women. A survey of students does not include homeschooled students. An election poll only interviews people with college degrees. 26.What is the term for the tendency to search for or interpret information in a way that validates pre-existing beliefs? Sampling bias Confirmation bias Observer bias Interpretation bias - ANSWER Confirmation bias 27.Which of the following terms are also ways of describing observer bias? Select all that apply. Perception bias Research bias Spectator bias Experimenter bias - ANSWER Research bias Spectator bias Experimenter bias 28.Fill in the blank: Data is considered _____ when it is accurate, complete, and unbiased information that has been vetted and proven fit for use. original current comprehensive reliable - ANSWER reliable 29.Which of the following are usually good data sources? Select all that apply. Vetted public datasets Social media sites Governmental agency data Academic papers - ANSWER Vetted public datasets Governmental agency data Academic papers 30.Multi-Column Index - ANSWER What type of index am I? 31.Each index entry is a composite of values from all indexed columns. 32.Dense Index - ANSWER What type of index am I? 33.Contains an entry for every table row. 34.Sparse Index - ANSWER What type of index am I? 35.Contains an entry for every table block. 36.Table scan - ANSWER A database operation that reads table blocks directly, without accessing an index. 37.Index scan - ANSWER A database operation that reads index blocks sequentially, in order to locate the needed table blocks. 38.Hit Ratio - ANSWER The percentage of table rows selected by a query. 39.Primary Index/Clustering Index - ANSWER What type of index am I? An index on a sort column. 40.Secondary Index/Nonclustering Index - ANSWER What type of index am I? 41.An index that is not on the sort column. 42.Binary Search - ANSWER The database repeatedly splits the index in two until it finds the entry containing the search value. 43.Multi-Level Index - ANSWER What type of index am I? 44.Stores column values and row pointers in a hierarchy. 45.B+Tree - ANSWER All indexed values appear in the bottom level. Pointers to table blocks appear only in the bottom level. Since some indexed values also appear in higher levels, values are occasionally repeated in the index. 46.B-Tree - ANSWER If an indexed value appears in a higher level, the value is not repeated at lower levels. Instead, a pointer to the corresponding table block appears in the higher level along with the value. 47.Hash Index - ANSWER What type of index am I? Index entries are assigned to buckets. 48.Bitmap Index - ANSWER What type of index am I? 49.This index is a grid of bits. 50.Physical Index - ANSWER What type of index am I?