Data unit test
A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.
Bias in a program
Why digital data is discrete
Sound as binary
Metadata
Personally identifiable information (PII)
Abstraction
Data cleaning
Open data
Images as binary
Why large datasets need programs
Number of values in n bits
Round-off error
Short answer 1. Define or explain: Bias in data collection
3 ptsShort answer 2. Define or explain: Overflow vs round-off
3 ptsShort answer 3. Define or explain: Text as binary
3 ptsShort answer 4. Define or explain: Analog vs digital data
3 ptsFree response
6 ptsThis course has no free-response prompt tagged to this unit, so one from elsewhere in the course is used. It is still worth writing — the skill transfers.
A team is writing a program that repeatedly needs the average of a list of numbers: once for quiz scores, once for homework scores, and once for attendance percentages. Their first draft copies the same six lines of code into three places.
Write a procedure average(numbers) in AP-style pseudocode that returns the average of the values in a list, returning 0 for an empty list. List indexes begin at 1.
Explain how defining this procedure manages the complexity of the program.
Explain the role of the parameter and of the return value, and why the procedure is more useful with a parameter than if it always used one fixed global list.
The team then wants a procedure highestAverage that takes three lists and returns the largest of their averages. Describe how it should be written, and name the abstraction it depends on.