Exam (elaborations)
IOP SEMESTER 1 ASSIGNMENT 1
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3/21/23, 10:44 AM Assessment 1: Attempt reviewMENU
Dashboard / My courses / IOP2601-23-S1 / Welcome Message / Assessment 1
Started on Monday, 20 March 2023, 9:16 AM
State Finished
Completed on Tuesday, 21 March 2023, 10:43 AM
Time taken 1 day 1 hour
Grade 25.00 out of 30.00 (83%)
Question 1
Correct
Mark 1.00 out of 1.00
Which of the following is the most important and a more complete measure of variability that gives us an indication of how far, on average,
each score is from the mean?
A. Mode.
B. Variance.
C. Range.
D. Median
well done😊
Go through Lesson 3 in the prescribed book by Tredoux and Durrheim (2019). For guidance, also refer to page 55 of the study guide, Lesson
6.
The correct answer is: Variance.
https://mymodules.dtls.unisa.ac.za/mod/quiz/review.php?attempt=7853368&cmid=592693#question-7986681-3 1/15
, 3/21/23, 10:44 AM Assessment 1: Attempt review
Question 2
Correct
Mark 1.00 out of 1.00
MENU
Use the data sets below to answer the question that follows.
Dashboard
X: 7 9 8 7 6 8/1 My
6 9 courses
8 / 1IOP2601-23-S1
Y: 2 2 3 1 2 4 5 4 5/ Welcome Message / Assessment 1
What is the mean of X (𝑋 )?
A. 7,5
B. 14
C. 69
D. 6,9
Well done😊
Answer: The mean of X is:
= Σx /n
= 69/10
= 𝟔,𝟗
See study guide from page 44, Lesson 5.
The correct answer is: 6,9
Question 3
Correct
Mark 1.00 out of 1.00
Which one of the following describes the graph of a normal distribution?
A. Bell-shaped
B. Symmetrical.
C. Bimodal
D. Bell-shaped and Symmetrical
Well done😊
A normal distribution is symmetric, unimodal, and bell-shaped. Go through Tutorial 2 of Tredoux and Durrheim (2019). Also refer to your
study guide, Lesson 4, from page 39.
The correct answer is: Bell-shaped and Symmetrical
https://mymodules.dtls.unisa.ac.za/mod/quiz/review.php?attempt=7853368&cmid=592693#question-7986681-3 2/15
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