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.
Text as binary
Bit
Converting binary to decimal
Bias in a program
Binary number system
Personally identifiable information (PII)
Open data
Why digital data is discrete
Data cleaning
Data visualization
Lossy compression
Extracting information from data
Short answer 1. Define or explain: Information vs data
3 ptsShort answer 2. Define or explain: Abstraction
3 ptsShort answer 3. Define or explain: Correlation vs causation
3 ptsShort answer 4. Define or explain: Bias in data collection
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.