Understanding Data Compression and Binary Concepts

Sandy Cha from Riverside Brookfield High School presents a CS Principles daily practice session focusing on data. The session covers binary representation, unique ID numbers, and metadata analysis. It also discusses pattern searching in data, task duration scaling, and sound quality differences due to compression. The video concludes with a practical example of list processing and sorting.

Which of the following can be represented by a single binary digit?

• The remainder when dividing a whole number by two

• The volume of a car radio

• The position of the minute hand of a clock

• The value of a Boolean variable

What is the result of using a seven-bit binary sequence instead of a six-bit sequence?

• Two more items can be uniquely identified

• Ten times as many items can be uniquely identified

• Ten more items can be uniquely identified

• Twice as many items can be uniquely identified

If the last student enrolled has the binary ID 110011, what will be the ID of the next student?

• 10010100

• 11010111

• 10010111

• 11010100

Which of the following cannot be determined using the given database information?

• The date when a certain movie was purchased

• The greatest number of times a movie was purchased

• The number of movies purchased by an individual subscriber for a particular month

• The total number of cities in which a certain movie was purchased

For which goal would it be most useful to analyze metadata instead of data?

• To generate a list of criminal suspects when given the phone number of a known criminal

• To determine the number of phone calls placed next Monday between 10:30 and noon

• Both B and C

• To determine if a caller frequently uses a specific word

Which task is not an example of searching for patterns to produce useful information?

• A credit card company analyzing credit purchases to identify potential fraudulent charges

• A grocery store analyzing customers' past purchases to suggest new products

• An online retailer analyzing customers' viewing habits to suggest other products

• A high school analyzing student grades to identify the top 10 highest GPAs

Which task is likely to take the longest time when scaled up for a very large company?

• Deleting entries from data

• Searching through data

• Backing up data

• Sorting data

Why might a saved copy of a song have lower sound quality than the original recording?

• The song was saved using a lossless compression technique

• The song was saved using more bits per second than the original

• Information is lost every time a file is saved from one location to another

• The song was saved using fewer bits per second than the original

What is the correct order of operations to create a new list of book names in alphabetical order with duplicates removed?

• Combine lists, sort, remove duplicates

• Sort lists, combine, remove duplicates

• Remove duplicates, combine, sort

• Remove duplicates, sort, combine

What is an example of lossy compression?

• Transferring a file from one location to another

• Using a lossless compression technique

• Saving a song with more bits per second

• Saving a song with fewer bits per second