Big Idea 2 Review

Which data compression technique provides the most compression?

• Lossy

• Lossless

• Filtering

• Classification

Which of the following best describes abstraction?

• Adding complexity so the concept can apply to more uses.

• Simplifying complexity to make the concept more general.

• Combining procedures to make a new one.

• A set of instructions to do a task.

Why is cleaning data important?

• It ensures incomplete data does not hide or skew results.

• It removes bad data.

• It repairs incomplete data.

• All of the above.

What is the number system used by computers?

• Base 10 (decimal)

• Base 8 (Octal)

• Base 2 (Binary)

• Base 16 (Hexidecimal)

What is information about the author of a document considered to be?

• Metadata

• Content

• Context

• Mididata

What is the amount of data compression an algorithm can produce reliant upon?

• No repeating parts of the file being compressed

• Several patterns in the data

• A large file size

• A small file size

The letter 'M' is represented by 01001101 in binary, what is this in decimal?

• 414

• 76

• 77

• 1101

How many more bits are available when you go from a 32-bit computer to a 64-bit computer?

• Twice as many

• 32 more

When running a program that counts the number of records in a large dataset, you receive an error on your computer screen, in binary format: 11110001

Convert the error message to decimal to look it up.

• 239 - Invalid operation. Corrupt data caused the error.

• 240 - Decimal numbers are stored imprecisely in computers. A rounding error occurred.

• 241 - Overflow error. The object exceeded its maximum size. The dataset is too large to run on your computer.

• 404 - Error message not found

Which of the following techniques would be best to use to further analyze patterns that emerged during data mining?

i. Classifying data to categorize it into distinct groups

ii. Cleaning data to determine which data to include in the processing

iii. Clustering data to separate data with similarities into subclasses.

iv. Filtering to set conditions so only records meeting the criteria are included

• i, ii, iii

• i, iii, iv

• i, ii, iv

• i, ii, iii, iv