Comp Sci Unit 9 - Data Review

A system is being developed to help pet owners locate lost pets. Which of the following best describes a system that uses crowdsourcing?

A mobile application that allows users to report the location of a pet that appears to be lost and upload a photo that is made available to other users of the application

Which of the following applications is most likely to benefit from the use of crowdsourcing?

An application that allows users to view descriptions and photographs of local landmarks

Which of the following activities is most likely to be successful as a citizen science project?

Collecting pictures of plants from around the world that can be analyzed to look for regional differences in plant growth.

Open data

Data that can be accessed, updated, reused, and exchanged by anyone and everyone.

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

Lossless Compression

Every bite of the original data can be recovered from the compressed file

A certain social media application is popular with people across the United States. The developers of the application are updating the algorithm used by the application to introduce a new feature that allows users of the application with similar interests to connect with one another. Which of the following strategies is LEAST likely to introduce bias into the application?

Inviting a random sample of all users to try out the new algorithm and provide feedback before it is released to a wider audience

The developers of a music-streaming application are updating the algorithm they use to recommend music to listeners. Which of the following strategies is LEAST likely to introduce bias into the application?

Making recommendations based on listening data gathered from a random sample of users of the application

Crowdsourcing

Obtaining work, information, or opinions from a large group of people who submit their data via the Internet.

A mobile game tracks players' locations using GPS. The game offers special in-game items to players when they visit real-world points of interest. Which of the following best explains how bias could occur in the game?

Points of interest may be more densely located in cities, favoring players in urban areas over players in rural areas.

Bandwidth

The amount of data that can be transmitted over a network in a given amount of time.

A small team of wildlife researchers is working on a project that uses motion-activated field cameras to capture images of animals at study sites. The team is considering using a "citizen science" approach to analyze the images. Which of the following best explains why such an approach is considered useful for this project?

The image analysis is likely to take a longer time for the research team than for a distributed group of individuals.

Lossy compression

The number of bits needed to store or transmit info is reduced. original data cannot be reconstructed.

A mobile application is used to display local traffic conditions. Which of the following features of the application best exemplifies the use of crowdsourcing?

Users can submit updates on local traffic conditions in real time.

A student is creating a Web site that is intended to display information about a city based on a city name that a user enters in a text field. Which of the following are likely to be challenges associated with processing city names that users might provide as input?

Users might enter abbreviations for the names of cities. Users might misspell the name of the city.

Not reasonable time

Usually exponential in the number of steps, like doubling every time your input grows by one

Metadata

data about data Can increase the effective use of data or data sets by providing additional info about various aspects of that data

Reasonable time

polynomial in the number of steps an algorithm takes in the worst case based on the input size