StatTutor Lesson - Spotting Suspected Outliers

true
Stat Tutor
true
true
You have completed 0 question sequences out of 4.
Current Time 0:00
Duration 0:00
Loaded: 0%
Stream Type LIVE
Remaining Time 0:00
 
1x
    • Chapters
    • descriptions off, selected
    • captions off, selected

      Questions 1-3

      57

      Question 1.

      True or false: Range equals the largest observation minus the smallest observation.

      		A.
      		B.
      Incorrect. This is a correct statement.
      Correct. This is a correct statement.
      Incorrect. Try again.
      2

      Question 4

      168

      Question 4.

      The five-number summary of test scores in an introductory statistics class is: Min = 23% Q1 = 71% Median = 83%, Q3 = 86% and Max = 100%. For these data, what is interquartile range?

      		A.
      		B.
      		C.
      		D.
      Incorrect. Interquartile range = Q3 minus Q1 = 86% minus 71% = 15%.
      Correct. Interquartile range = Q3 minus Q1 = 86% minus 71% = 15%.
      Incorrect. Try again.
      2

      Question 5

      216

      Question 5.

      Why are range and interquartile range seldom used?

      		A.
      		B.
      		C.
      		D.
      Incorrect. Because of the complex theoretical properties of range and interquartile range, they are seldom used.
      Correct. Because of the complex theoretical properties of range and interquartile range, they are seldom used.
      Incorrect. Try again.
      2

      Question 6

      325

      Question 6.

      The five-number summary of test scores in an introductory statistics class is: Min = 23% Q1 = 71% Median = 83%, Q3 = 86% and Max = 100%. For these data, is the minimum value of 23% an outlier according to the rule: Observation < Q1 – (1.5xIQR)? Note: IQR = 15%

      		A.
      		B.
      Incorrect. Q1 – 1.5xIQR = 71% - 1.5x15% = 48.5%. Since 23% < 48.5%, it is an outlier.
      Correct. Q1 – 1.5xIQR = 71% - 1.5x15% = 48.5%. Since 23% < 48.5%, it is an outlier.
      Incorrect. Try again.
      2