Big Idea 2: Data Questions

Front

A certain programming language uses 4-bit binary sequences to represent nonnegative integers. For example, the binary sequence 0101 represents the corresponding decimal value 5. Using this programming language, a programmer attempts to add the decimal values 14 and 15 and assign the sum to the variable total. Which of the following best describes the result of this operation?

Back

An overflow error will occur because 4 bits is not large enough to represent 29, the sum of 14 and 15.

Front

Which of the following is an advantage of a lossless compression algorithm over a lossy compression algorithm? Options: A lossless compression algorithm can guarantee that compressed information is kept secure, while a lossy compression algorithm cannot. A lossless compression algorithm can guarantee reconstruction of original data, while a lossy compression algorithm cannot. A lossless compression algorithm typically allows for faster transmission speeds than does a lossy compression algorithm. A lossless compression algorithm typically provides a greater reduction in the number of bits stored or transmitted than does a lossy compression algorithm.

Back

A lossless compression algorithm can guarantee reconstruction of original data, while a lossy compression algorithm cannot.

Front

A video game character can face toward one of four directions: north, south, east, and west. A new version of the game is created in which the character can face toward one of eight directions, adding northwest, northeast, southwest, and southeast to the original four possibilities. Which of the following statements is true about how the eight directions must be stored in memory? Four bits are enough to store the eight directions.

Back

Four bits are enough to store the eight directions.

Front

A team of researchers wants to create a program to analyze the amount of pollution reported in roughly 3,000 counties across the United States. The program is intended to combine county data sets and then process the data. Which of the following is most likely to be a challenge in creating the program?

Back

Different counties may organize data in different ways.

Front

A user wants to save a data file on an online storage site. The user wants to reduce the size of the file, if possible, and wants to be able to completely restore the file to its original version. Which of the following actions best supports the user’s needs? Options: Compressing the file using a lossless compression algorithm before uploading it, Compressing the file using a lossy compression algorithm before uploading it, Compressing the file using both lossy and lossless compression algorithms before uploading it, Uploading the original file without using any compression algorithm.

Back

Compressing the file using a lossless compression algorithm before uploading it

Front

A company uses the pictured data files. A new rechargeable battery pack is available for products that use AA batteries. Which of the following best explains how the data files in the table can be used to send a targeted e-mail to only those customers who have purchased products that use AA batteries to let them know about the new accessory? Options: Use the customer IDs in the purchases file to search the customers file to generate a list of e-mail addresses, Use the product IDs in the purchases file to search the products file to generate a list of product names that use AA batteries, Use the customers file to generate a list of customer IDs, then use the list of customer IDs to search the products file to generate a list of product names that use AA batteries, Use the products file to generate a list of product IDs that use AA batteries, then use the list of product IDs to search the purchases file to generate a list of customer IDs, then use the list of customer IDs to search the customers file to generate a list of e-mail addresses.

Back

Use the products file to generate a list of product IDs that use AA batteries, then use the list of product IDs to search the purchases file to generate a list of customer IDs, then use the list of customer IDs to search the customers file to generate a list of e-mail addresses.

Front

Which of the following are true statements about the data that can be represented using binary sequences? I. Binary sequences can be used to represent strings of characters. II. Binary sequences can be used to represent colors. III. Binary sequences can be used to represent audio recordings.

Back

I, II, and III

Front

Consider the 4-bit binary numbers 0011, 0110, and 1111. Which of the following decimal values is NOT equal to one of these binary numbers? 3, 6, 9, 15

Back

9

Front

Which additional piece of information would be most useful in determining the artist with the greatest attendance during a particular month? Average ticket price, Length of the show in minutes, Start time of the show, Total dollar amount of food and drinks sold during the show

Back

Average ticket price

Front

The position of a runner in a race is a type of analog data. The runner’s position is tracked using sensors. Which of the following best describes how the position of the runner is represented digitally?

Back

The position of the runner is sampled at regular intervals to approximate the real-word position, and a sequence of bits is used to represent each sample.