Quiz: Central Tendency, Variability, and Correlation
Due Aug 1 at 11:59pm Points 30 Questions 10 Time Limit 60 Minutes
Allowed Attempts Unlimited
Instructions
Attempt History
Attempt Time Score
LATEST Attempt 1 10 minutes 18 out of 30
Correct answers are hidden.
Score for this attempt: 18 out of 30
Submitted Aug 6 at 10:51pm
This attempt took 10 minutes.
The quiz:
Covers the Textbookmaterial from Module 5: Week 5.
Contains 10 multiple-choicequestions.
Islimitedto60 minutes.
Allows unlimited attempts and the highest attempt will count towards the grade.
Is worth 20 points.
You may refer to your notes and textbooks at any time during the assessment.
Submit this assignment by 11:59 p.m. (ET) on Sunday of Module 5: Week 5.
TAKE THE QUIZ AGAIN
0 / 3 pts
Question 1
Incorrect
Incorrect
The distribution below is :
negatively skewed.
normal.
positively skewed.
rectangular.
3 / 3 pts
Question 2
With which term is the mean synonymous?
Average
Frequency
Interval
Midpoint
3 / 3 pts
Question 3
In a frequency distribution of 290 scores, the mean is 99 and the median is 86. One
would expect this distribution to be:
negatively skewed.
normal.
positively skewed.
symmetrical.
3 / 3 pts
Question 4
Which of the following fall(s) at a z-score of 0.0 in a normal distribution?
Mean
Median
Mode
Mean, media and mode
3 / 3 pts
Question 5
The most dependable derived unit for measuring how far a score varies from the mean
for the group is called the:
average deviation.
quartile deviation.
standard error.
standard deviation.
0 / 3 pts
Question 6
Incorrect
Incorrect
Assume that a set of 90 normally distributed test scores has a mean of 70 and a
standard deviation of 10. Which of the following represents the highest degree of
relative performance?
A percentile rank of 20
A raw score of 67
A T-score of 35
A z-score of - 1.2
3 / 3 pts
Question 7
In a normal distribution, what percentage of scores will fall between -1 standard
deviation and +1 standard deviation?
34%
50%
68%
84%
0 / 3 pts
Question 8
Incorrect
Incorrect
The coecient of determination is used to:
compute correlations for truncated ranges.
compare the relative strength of coecients.
identify curvilinear relationships.
test correlations for causality.
3 / 3 pts
Question 9
A research worker gave a scholastic aptitude test to a sample of eighth graders. Then
he correlated the aptitude test scores with the chronological ages of the subjects. He
found a correlation of - .42. How should this result be interpreted?
He obviously made a computational error.
His sample was composed of pupils with low academic potential.
The older members of the grade tended usually to be pupils with low academic potential
and vice-versa.
The relationship between age and intelligence decreases as people reach the age of 14.
0 / 3 pts
Question 10
Incorrect
Incorrect
When a relationship between two variables is curvilinear, a linear correlation coecient
computed for each data will be:
