MCQs / Computer Science / Unit 4: Data and Analysis

Unit 4: Data and Analysis MCQs — Computer Science (page 3)

54 multiple-choice questions on Unit 4: Data and Analysis from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

51. The standard deviation of 2, 4, 4, 4, 5, 5, 7, 9 (population) is:

  1. 4
  2. 5
  3. 32
  4. 2.0

Answer: D) 2.0

Explanation: Variance = 32/8 = 4, SD = √4 = 2. SLO CS-11-D-03

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52. YouTube showing two thumbnails to different random viewers to see which gets more clicks is:

  1. a census
  2. A/B testing (an experiment)
  3. smoothing
  4. K-means

Answer: B) A/B testing (an experiment)

Explanation: A/B testing is a randomised experiment comparing two versions. SLO CS-11-D-02

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53. In "a red Buy button increases sales", the button colour is the:

  1. dependent variable
  2. confounder
  3. independent variable
  4. control group

Answer: C) independent variable

Explanation: The experimenter changes the independent variable and measures the dependent variable (sales). SLO CS-11-D-02

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54. Collecting data from every member of a population is a:

  1. random sample
  2. sample survey
  3. census
  4. pilot study

Answer: C) census

Explanation: A census covers the whole population. SLO CS-11-D-02

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