Comp Sci Unit 3 #3

A teacher sends students an anonymous survey in order to learn more about the students’ work habits. The survey contains the following questions.

• -On average, how long does homework take you each night (in minutes) ?

• -On average, how long do you study for each test (in minutes) ?

• -Do you enjoy the subject material of this class (yes or no) ?

Which of the following questions about the students who responded to the survey can the teacher answer by analyzing the survey results?

1. Do students who enjoy the subject material tend to spend more time on homework each night than the other students do?

2. Do students who spend more time on homework each night tend to spend less time studying for tests than the other students do?

3. Do students who spend more time studying for tests tend to earn higher grades in the class than the other students do?

• 
  I only

• III only

• I and II

• I and III

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?

1. -To determine if a caller frequently uses a specific word

2. -To estimate the number of phone calls that will be placed next Monday between 10:30 A.M. and noon.

3. -To generate a list of criminal suspects when given the telephone number of a known criminal

• I only

• II only

• II and III only

• I, II, and III

Directions: The question or incomplete statement below is followed by four suggested answers or completions. Select the one that is best in each case.

A search engine has a trend-tracking feature that provides information on how popular a search term is. The data can be filtered by geographic region, date, and category. Categories include arts and entertainment, computers and electronics, games, news, people and society, shopping, sports, and travel. Which of the following questions is LEAST likely to be answerable using the trends feature?

• In what month does a particular sport receive the most searches?

• In which political candidates are people interested?

• What is the cost of a certain electronics product?

• Which region of the country has the greatest number of people searching for opera performances?

A library system contains information for each book that was borrowed. Each time a person borrows or returns a book from the library, the following information is recorded in a database.

• Name and the unique ID number of the person who was borrowing the book

• Author, title, and the unique ID number of the book that was borrowed

• Date that the book was borrowed

• Date that the book was due to be returned

• Date that the book was returned (or 0 if the book has not been returned yet)

Which of the following CANNOT be determined from the information collected by the system?

• The total number of books borrowed in a given year

• The total number of books that were never borrowed in a given year

• The total number of books that were returned past their due date in a given year

• The total number of people who borrowed at least one book in a given year

A list of binary values (0 or 1) is used to represent a black-and-white image. Which of the following is LEAST likely to be stored as metadata associated with the image?

• Copyright information for the image

• The date and time the image was created

• The dimensions (number of rows and columns of pixels) of the image

• A duplicate copy of the data

Delivery trucks enter and leave a depot through a controlled gate. At the depot, each truck is loaded with packages, which will then be delivered to one or more customers. As each truck enters and leaves the depot, the following information is recorded and uploaded to a database.

• -The truck’s identification number

• -The truck’s weight

• -The date and time the truck passes through the gate

• -Whether the truck is entering or leaving the depot

Using only the information in the database, which of the following questions CANNOT be answered?

• On which day in a particular range of dates did the greatest number of trucks enter and leave the depot?

• What is the average number of customer deliveries made by each truck on a particular day?

• What is the change in weight of a particular truck between when it entered and left the depot?

• Which truck has the shortest average time spent at the depot on a particular day?

Directions: The question or incomplete statement below is followed by four suggested answers or completions. Select the one that is best in each case.

A library of e-books contains metadata for each book. The metadata are intended to help a search feature find books that users are interested in. Which of the following is LEAST likely to be contained in the metadata of each e-book?

• An archive containing previous versions of the e-book

• The author and title of the e-book

• The date the e-book was first published

• The genre of the e-book (e.g., comedy, fantasy, romance, etc.)

A file storage application allows users to save their files on cloud servers. A group of researchers gathered user data for the first eight years of the application’s existence. Some of the data are summarized in the following graphs. The line graph on the left shows the number of registered users each year. The line graph on the right shows the total amount of data stored by all users each year. The circle graph shows the distribution of file sizes currently stored by all users.

(note: 1 MB = 1,000 KB)

Which of the following best describes the growth in the number of registered users for the first eight years of the application’s existence?

• The number of registered users increased at about a constant rate each year for all eight years.

• 
  The number of registered users increased at about a constant rate for years 1 to 5 and then about doubled each year after that.

• The number of registered users about doubled each year for years 1 to 5 and then increased at about a constant rate after that.

• The number of registered users about doubled each year for all eight years.

Directions: The question or incomplete statement below is followed by four suggested answers or completions. Select the one that is best in each case.

A smartphone stores the following data for each photo that is taken using the phone.

• The file name of the photo

• The date and time the photo was taken

• The geographic location where the photo was taken

Assume that all of the photos that have been taken on the phone are accessible. Which of the following can be determined using the photo data described above?

      I. The number of photos that were taken at a particular geographic location
     II. The number of photos that were taken in the last year
    III. The name of the person who took the most recent photo

• III only

• I and II only

• 
  I and III only

• I, II, and III

A camera mounted on the dashboard of a car captures an image of the view from the driver’s seat every second. Each image is stored as data. Along with each image, the camera also captures and stores the car’s speed, the date and time, and the car’s GPS location as metadata. Which of the following can best be determined using only the data and none of the metadata?

• The average number of hours per day that the car is in use

• The car’s average speed on a particular day

• The distance the car traveled on a particular day

• 
  The number of bicycles the car passed on a particular day