WorksheetsUnit 2 Chapter 2
Total questions: 16
Worksheet time: 19mins
The AP CS Principles framework contains the following statement:
7.1.1G Search trends are predictors.
Which of the following is the most accurate statement about using search trends as predictors of future events?
Search trends are imperfect predictors of future events that fully represent society at large
Search trends are accurate and reliable predictors of future events that fully represent society at large.
Search trends are imperfect predictors of future events that may not fully represent society at large.
Search trends are accurate and reliable predictors of future events that may not fully represent society at large.
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?
Approximately how many miles did the animal travel in one week?
Does the animal travel in groups with other tracked animals?
Do the movement patterns of the animal vary according to the weather?
In what geographic locations does the animal typically travel?
Computers are often used to search through large sets of data to find useful patterns in the data. Which of the following tasks is NOT an example where searching for patterns is needed to produce useful information?
A credit card company analyzing credit card purchases to identify potential fraudulent charges
A grocery store is analyzing customers' past purchases to suggest new products the customer may be interested in
A high school analyzing student grades to identify the students with the top ten highest grade point averages
An online retailer analyzing customers' viewing habits to suggest other products based on the purchasing history of other customers
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?
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 places 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 places next Monday between 10:30 AM and noon
III. 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
Consider the following numbers given in binary (BIN), decimal (DEC), and hexadecimal representations:
BIN: 1110
DEC: 13
HEX: F
Which of the following lists the numbers in order from least to greatest?
BIN: 1110, DEC: 13, HEX: F
DEC: 13, BIN: 1110, HEX: F
DEC: 13, HEX: F, BIN: 1110
HEX: F, DEC: 13, BIN: 1110
The chart below from Google Trends shows the prevalence of some search terms in the United States between 2004 and present. Which of the following is the most accurate statement of what this chart is showing?
Since sometime around 2009, red has become the favorite color of more people
Generally speaking, since 2009 more people use "red" in their search terms more than they use "blue", "yellow", "green", or "purple"
The general decline in the search term "yellow" might be due to the decline in searches for yellow taxis, as car sharing services like Uber have become more popular
Generally speaking, the volume of internet searches is increasing over time because the number of people using the internet is also increasing.
A bakery collects data on sales. Each sales record includes the date of the sale and some metadata about the items that were part of the sale. The data includes: the names of the items sold, the types of items sold, the number of each item sold, and the price of each item sold. Which of the following CANNOT be determined from the bakery's data set?
The total income from sales the bakery received in the past month
Which customer most frequently purchases bread
The item bought in the highest quantity in the past week
Days when certain items sell the most
Which of the following is the most accurate statement about cleaning and filtering data?
Using computing tools to filter raw data makes it impossible to analyze or draw accurate conclusions
Filtering and cleaning data is a fully automated process that should not require human input or intervention
Filtering and cleaning data is necessary to ensure that data is in a form that is better for computers to process
Filtering and cleaning data is a human process that cannot involve the use of computers
Which of the following is the most accurate description of what is known as the "digital divide"?
The digital divide is about how…
People's access to computing and digital technology increases over time through a process of dividing and growing quickly – it is often likened to the biological process of cell growth.
People's access to computing and the Internet differs based on socioeconomic or geographic characteristics t
People's access to computing technology is affected by the fact that newer devices that use new protocols makes it more difficult for them to communicate with older devices and technology
The amount of data on the Internet is growing so fast that the amount of computing power and time we have to process it is lagging behind
Digital images are often represented by the red, green, and blue values (an RGB triplet) of each individual pixel in the image. A photographer is manipulating a digital image and overwriting the original image. Which of the following describes a lossless transformation of the digital image?
Modifying part of the image by taking the pixels in one part of the picture and copying them to pixels in another part of the picture.
Compressing the image in a way that may lose information but will only suffer a small loss of image quality.
Creating the gray scale image by averaging the amount of red, green, and blue in each pixel and assigning this new value to the corresponding pixel in the new image. The new value of each pixel represents a shade of gray, ranging from white to black.
Creating the negative of an image by creating a new RGB triplet for each pixel in which each value is calculated by subtracting the original value from 255. The negative of an image is reversed from the original; light areas appear dark, and colors are reversed.
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
A sample portion of the database is shown below. The database is sorted by date and movie title.
Which of the following CANNOT by determined using only the information in the database?
The date when a certain movie was purchased the greatest number of times
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
The total number of movies purchased in a certain city in a particular month
A certain social media website 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 users who post messages most frequently
To determine the time of day the site is most active
To determine the topics that many user are posting about
To determine which posts from a particular user have received the greatest number of comments
The survey of high school seniors asked:
What state do you live in? How likely are you to attend college in your home state? (on a scale of 1-5, with 5 meaning "very likely") What do you plan to study?
Amara does an initial computation on the data to make a summary table. A small segment is shown below.
Amara is tasked with cleaning the data to prepare it for further analysis. Which of the following would be the least appropriate modifications to make to the data to prepare it for further analysis?
Replace all non-integer values for "likelihood of staying in state" with 1
Translate all states into their two-letter state code
Removing the entire row with home state "adsfas" and recomputing
Group similar areas of study into a single area of study. For example: grouping Applied Mathematics and Mathematics together into "Mathematics"
Amara plans to use the survey data to create a visualization and short write up about students' plans for college, but first she wants to learn more about how the survey was conducted. Of the following things she might learn about the survey, which are the most likely sources of bias in the results based on how it was collected?
Choose two answers.
She learns that the survey administrators only asked a representative sample of students, rather than even student in each state
She learns that responses were collected only by mobile app
She learns the survey was available to complete in both digital and paper form
She learns that the survey was only given to students with scores in the top 10% on the PSAT
Amara decides to make a visualization of a portion of the responses showing only a few states and a few areas of study. She wants to make an effective visualization that shows for comparison: Students' average likelihood of attending college in-state broken down by which state they live in and what they plan to major in. For example, in Illinois (IL) on average students who want to study economics are very likely to say they want to attend college in-state.
Amara makes four different visualizations shown below (marked A, B, C, D). According to good principles of visualizations, and for what Amara wants to show, which one of these would be considered the best visual representation?
Chart A (Line Chart)
Chart B (Vertical Bar Chart)
Chart C (Stacked Line Chart)
Chart D (Stacked Vertical Bar Chart)
