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What is the purpose of data sampling in statistical analysis?
What is the purpose of data sampling in statistical analysis?
- To exclude data points and focus only on outliers
- To manipulate the data points and create a larger data set
- To select a representative subset of data points and identify patterns and trends (correct)
- To select all data points and analyze them comprehensively
What distinguishes standing queries from ad-hoc queries in the context of stream queries?
What distinguishes standing queries from ad-hoc queries in the context of stream queries?
- Ad-hoc queries are more complex and require real-time processing
- Standing queries are only asked once about streams
- Ad-hoc queries are designed to report maximum values in a stream
- Standing queries are permanently executing and produce outputs at appropriate times (correct)
What type of query aims to estimate the average or standard deviation of the last k elements in a data stream?
What type of query aims to estimate the average or standard deviation of the last k elements in a data stream?
- Selecting elements with a specific property from the stream
- Estimating moments (correct)
- Counting distinct elements
- Filtering a data stream
What does filtering a data stream involve?
What does filtering a data stream involve?
What is the primary purpose of counting distinct elements in the last k elements of a data stream?
What is the primary purpose of counting distinct elements in the last k elements of a data stream?
What is the primary purpose of estimating moments in a data stream?
What is the primary purpose of estimating moments in a data stream?
What distinguishes standing queries from ad-hoc queries in the context of stream queries?
What distinguishes standing queries from ad-hoc queries in the context of stream queries?
What does filtering a data stream involve?
What does filtering a data stream involve?
What type of query aims to count the number of distinct elements in the last k elements of a data stream?
What type of query aims to count the number of distinct elements in the last k elements of a data stream?
What is the purpose of data sampling in statistical analysis?
What is the purpose of data sampling in statistical analysis?
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