EXAM 1 MISY 5370 Chapter 6 questions with answers

EXAM 1 MISY 5370 Chapter 6 questions
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Observation: - CORRECT ANSWERS ✔✔set of recorded values of |\ |\ |\ |\ |\ |\ |\ |\ |\


variables associated with a single entity.
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"Data-mining approaches can be separated into two categories. - |\ |\ |\ |\ |\ |\ |\ |\ |\


CORRECT ANSWERS ✔✔" Supervised learning , Unsupervised
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learning


Supervised learning - - CORRECT ANSWERS ✔✔For prediction and
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classification.
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Unsupervised learning - - CORRECT ANSWERS ✔✔To detect |\ |\ |\ |\ |\ |\ |\ |\


patterns and relationships in the data.
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Data Sampling: - CORRECT ANSWERS ✔✔Extract a sample of
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data that is relevant to the business problem under
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consideration.


Data Preparation: - CORRECT ANSWERS ✔✔Manipulate the data
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to put it in a form suitable for formal modeling.
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Model Construction: - CORRECT ANSWERS ✔✔Apply the
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appropriate data-mining technique (regression, classification
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trees, k-means) to accomplish the desired data-mining task
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(prediction, classification, clustering, etc.). |\ |\ |\

, Model Assessment: - CORRECT ANSWERS ✔✔Evaluate models by
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comparing performance on appropriate data sets.
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When dealing with large volumes of data, - CORRECT ANSWERS
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✔✔it is best practice to extract a representative sample for
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analysis.


A sample is representative, - CORRECT ANSWERS ✔✔if the
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analyst can make the same conclusions from it as from the entire
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population of data.
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Data-mining algorithms typically are more effective - CORRECT
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ANSWERS ✔✔given more data. |\ |\ |\




When obtaining a representative sample, - CORRECT ANSWERS
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✔✔it is generally best to include as many variables as possible in
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the sample.
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After exploring the data with descriptive statistics and
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visualization, - CORRECT ANSWERS ✔✔the analyst can eliminate |\ |\ |\ |\ |\ |\ |\ |\


variables that are not of interest.
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The data in a data set are often said to be ________before they
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have been preprocessed. - CORRECT ANSWERS ✔✔"dirty" and
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"raw"
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