Computer Science Unit 9 Study Guide
A digital photo file contains data representing the level of red, green, and blue for each pixel in the photo. The file also contains metadata that describes the date and geographic location where the photo was taken. For which of the following goals would analyzing the metadata be more appropriate than analyzing the data?
Determining the likelihood that the photo was taken at a particular public event
Biologists often attach tracking collars to wild animals. For each animal, the following geolocation data is collected at frequent intervals. - The time - The date - The location of the animal Which of the following questions about a particular animal could NOT be answered using only the data collected from the tracking collars?
Do the movement patterns of the animal vary according to the weather?
A programmer is writing a program that is intended to be able to process large amounts of data. Which of the following considerations is LEAST likely to affect the ability of the program to process larger data sets?
How many programming statements the program contains
A large data set contains information about all students majoring in computer science in colleges across the United States. The data set contains the following information about each student. - The student's gender - The state in which the student attends college - The student's grade point average on a 4.0 scale Which of the following questions could be answered by analyzing only information in the data set?
How many states have a higher percentage of female computer science majors than male computer science majors attending college in that state?
When a cellular telephone user places a call, the carrier transmits the caller's voice as well as the voice of the person who is called. The encoded voices are the data of the call. In addition to transmitting the data, the carrier also stores metadata. The metadata of the call include information such as the time the call is placed and the phone numbers of both participants. For which of the following goals would it be more useful to computationally analyze the metadata instead of the data? I. To determine if a caller frequently uses a specific word II. To estimate the number of phone calls that will be placed next Monday between 10:30 A.M. and noon. III. To generate a list of criminal suspects when given the telephone number of a known criminal
II and III only
The table below shows the time a computer system takes to complete a specified task on the customer data of different-sized companies. Based on the information in the table, which of the following tasks is likely to take the longest amount of time when scaled up for a very large company of approximately 100,000 customers?
Sorting data
A cable television company stores information about movie purchases made by subscribers. Each day, the following information is summarized and stored in a publicly available database. - The day and date each movie was purchased - The title of each movie purchased - The cities where subscribers purchased each movie - The number of times each movie was purchased by subscribers in a given city
The total number of movies purchased in a certain city during a particular month
A certain social media Web site allows users to post messages and to comment on other messages that have been posted. When a user posts a message, the message itself is considered data. In addition to the data, the site stores the following metadata. - The time the message was posted - The name of the user who posted the message - The names of any users who comment on the message and the times the comments were made For which of the following goals would it be more useful to analyze the data instead of the metadata?
To determine the topics that many users are posting about
A retailer that sells footwear maintains a single database containing records with the following information about each item for sale in the retailer's store. Item identification number Footwear type (sneakers, boots, sandals, etc.) Selling price (in dollars) Size Color Quantity available Using only the database, which of the following can be determined?
Which items listed in the database are not currently in the store
Two lists, list1 and list2, contain the names of books found in two different collections. A librarian wants to create newList, which will contain the names of all books found in either list, in alphabetical order, with duplicate entries removed. Which of the following code segments will correctly create newList ?
list1 ← RemoveDuplicates (list1) list2 ← RemoveDuplicates (list2) newList ← Combine (list1, list2) newList ← Sort (newList)