Learning objectives
Describe what a data set is, and explain how a program answers a question about it by visiting and processing its values one at a time
Represent a data set as a table or chart and use it to plan an algorithm, deciding which values must be totaled, counted, compared or selected before any code is written
Identify a data set that suits a stated problem, and explain why data gathered to answer one question may not support conclusions about a different one
Explain how missing or inaccurate values in a data set can make a program give wrong or inefficient results, and describe checks that detect such values before they are used
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