12/14/24, 8:34 PM Module 4 Problem Set: Statistics - Zamboni - 2024C
Module 4 Problem Set
Due No due date
Points 5
Questions 25
Time Limit None
Attempt History
Attempt Time Score
LATEST Attempt 1 186 minutes 5 out of 5
Score for this quiz: 5 out of 5
Submitted Dec 8 at 4:07am
This attempt took 186 minutes.
Question 1
Not yet graded / 0 pts
What term refers to a frequency distribution that follows a bell-shaped, symmetrical, and unimodal
curve?
Your Answer:
Normal distribution
Normal distribution
Question 2
pts
A normal distribution can be defined by which of the following?
a. Mean
b. Standard deviation
c. Median
Correct!
d. a & b
Question 3
pts
The total area under the curve is equal to ______.
Correct!
1.00
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,12/14/24, 8:34 PM Module 4 Problem Set: Statistics - Zamboni - 2024C
0.50
0.75
2.00
Question 4
pts
Based on the 68-95-99.7 rule, what percentage of sample means lie within 2 standard deviations of the
mean?
99.7%
Correct!
95%
100%
68%
Question 5
Not yet graded / 0 pts
What is the purpose of calculating z-scores?
Your Answer:
To understand a score’s relative standing in the distribution
The purpose of calculating z-scores is to understand a score’s relative standing within a
distribution. The z-score standardizes scores from different data sets with different means.
Question 6
Not yet graded / 0 pts
Researchers surveyed 30 people about the number of hours they spent per day on social media. The
sample mean was 3 hours with a standard deviation of 0.75 hours. Using this information, answer the
following questions.
a. Calculate the z-score for a value of 5 hours.
b. Calculate the z-score for a value of 3.5 hours.
c. Calculate the z-score for a value of 2.5 hours.
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, 12/14/24, 8:34 PM Module 4 Problem Set: Statistics - Zamboni - 2024C
d. Calculate the raw value for a z-score of -1.33.
e. Calculate the raw value of a z-score of +2.68.
Your Answer:
A) z = 2.67
B) z = 0.67
C) z = -0.67
D) x = 2
E) x = 5.01
a. Calculate the z-score for a value of 5 hours.
b. Calculate the z-score for a value of 3.5 hours.
c. Calculate the z-score for a value of 2.5 hours.
https://portagelearning.instructure.com/courses/2373/quizzes/54623?module_item_id=287702 3/16
Module 4 Problem Set
Due No due date
Points 5
Questions 25
Time Limit None
Attempt History
Attempt Time Score
LATEST Attempt 1 186 minutes 5 out of 5
Score for this quiz: 5 out of 5
Submitted Dec 8 at 4:07am
This attempt took 186 minutes.
Question 1
Not yet graded / 0 pts
What term refers to a frequency distribution that follows a bell-shaped, symmetrical, and unimodal
curve?
Your Answer:
Normal distribution
Normal distribution
Question 2
pts
A normal distribution can be defined by which of the following?
a. Mean
b. Standard deviation
c. Median
Correct!
d. a & b
Question 3
pts
The total area under the curve is equal to ______.
Correct!
1.00
https://portagelearning.instructure.com/courses/2373/quizzes/54623?module_item_id=287702 1/16
,12/14/24, 8:34 PM Module 4 Problem Set: Statistics - Zamboni - 2024C
0.50
0.75
2.00
Question 4
pts
Based on the 68-95-99.7 rule, what percentage of sample means lie within 2 standard deviations of the
mean?
99.7%
Correct!
95%
100%
68%
Question 5
Not yet graded / 0 pts
What is the purpose of calculating z-scores?
Your Answer:
To understand a score’s relative standing in the distribution
The purpose of calculating z-scores is to understand a score’s relative standing within a
distribution. The z-score standardizes scores from different data sets with different means.
Question 6
Not yet graded / 0 pts
Researchers surveyed 30 people about the number of hours they spent per day on social media. The
sample mean was 3 hours with a standard deviation of 0.75 hours. Using this information, answer the
following questions.
a. Calculate the z-score for a value of 5 hours.
b. Calculate the z-score for a value of 3.5 hours.
c. Calculate the z-score for a value of 2.5 hours.
https://portagelearning.instructure.com/courses/2373/quizzes/54623?module_item_id=287702 2/16
, 12/14/24, 8:34 PM Module 4 Problem Set: Statistics - Zamboni - 2024C
d. Calculate the raw value for a z-score of -1.33.
e. Calculate the raw value of a z-score of +2.68.
Your Answer:
A) z = 2.67
B) z = 0.67
C) z = -0.67
D) x = 2
E) x = 5.01
a. Calculate the z-score for a value of 5 hours.
b. Calculate the z-score for a value of 3.5 hours.
c. Calculate the z-score for a value of 2.5 hours.
https://portagelearning.instructure.com/courses/2373/quizzes/54623?module_item_id=287702 3/16
