ACARA Digital Technologies Years 9–10 Word Scramble: Data Compression and Acquiring and Validating Data (Modules 226–254)
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Date:
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Word scramble
Unscramble the letters and write each key term on the line.
1
LFEI > XTOEPR
Audacity menu path that saves a recording as WAV or MP3 at a chosen quality, so you can compare file size and sound quality of the same audio.
2
DTVPAIAE TRBIATE
Streaming that lowers the bitrate of compressed audio and video on slow connections, trading quality for smooth playback with less buffering.
3
EOSSCMREDP ELFI AFOMRT
A file type that stores data compressed: ZIP, PNG, FLAC are lossless; JPEG, MP3, MP4 are lossy. Each suits its content, such as photos, logos, music, video or documents.
4
EAUEBCS
Linking word in an explanation: name the technique, say how it shrinks the file, and state what is lost or kept, e.g. MP3 is smaller ______ it drops sounds you can't hear.
5
TAAD NIEECSC
Using data to answer questions and make decisions by following a purposeful process, instead of guessing. For example, using sport or health data to find real answers.
6
AATD ISECENC FLIE ECYCL
A repeating cycle of five stages: define the objective, acquire data, clean it, analyse it, communicate insights. Findings can send you back to an earlier stage.
7
ATDA ENSECIC EOSLR
Data engineers prepare data, data analysts explore it and share results, and data scientists build models and insights. Together they share the data science life cycle.
8
ESAMLP
The part of a population you collect data from. It must represent the whole population, so use a big enough size, choose randomly and avoid sampling bias.
9
ITOPL ETTS
Trying a survey on a few people first to find confusing questions, missing options and timing problems before the real data collection begins.
Answer Key
ACARA Digital Technologies Years 9–10 · Modules 226–254
1LFEI > XTOEPR → File > Export — Audacity menu path that saves a recording as WAV or MP3 at a chosen quality, so you can compare file size and sound quality of the same audio.
2DTVPAIAE TRBIATE → adaptive bitrate — Streaming that lowers the bitrate of compressed audio and video on slow connections, trading quality for smooth playback with less buffering.
3EOSSCMREDP ELFI AFOMRT → Compressed file format — A file type that stores data compressed: ZIP, PNG, FLAC are lossless; JPEG, MP3, MP4 are lossy. Each suits its content, such as photos, logos, music, video or documents.
4EAUEBCS → because — Linking word in an explanation: name the technique, say how it shrinks the file, and state what is lost or kept, e.g. MP3 is smaller because it drops sounds you can't hear.
5TAAD NIEECSC → data science — Using data to answer questions and make decisions by following a purposeful process, instead of guessing. For example, using sport or health data to find real answers.
6AATD ISECENC FLIE ECYCL → data science life cycle — A repeating cycle of five stages: define the objective, acquire data, clean it, analyse it, communicate insights. Findings can send you back to an earlier stage.
7ATDA ENSECIC EOSLR → data science roles — Data engineers prepare data, data analysts explore it and share results, and data scientists build models and insights. Together they share the data science life cycle.
8ESAMLP → sample — The part of a population you collect data from. It must represent the whole population, so use a big enough size, choose randomly and avoid sampling bias.
9ITOPL ETTS → pilot test — Trying a survey on a few people first to find confusing questions, missing options and timing problems before the real data collection begins.