STATISTICS Math 221
Devry University
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Math 221 Week 1 Quiz Answers help questions and answers well elaborated
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Question 1 
2 / 2 pts 
A recent survey of the alumni of a university indicated that the average salary of 10,000 
of its 200,000 graduates was $130,000. The $130,000 would be considered a: 
Population 
Parameter 
Sample 
Statistic 
IncorrectQuestion 2 
0 / 2 pts 
A recent survey of the alumni of a university indicated that the average salary of 10,000 
of its 200,000 graduates was $130,000. The 10,000 would be considered a: 
Population 
Parameter 
Sample 
Statistic 
Question 3 
2 / 2 pts 
Based ...
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Math 221 Week 2 Homework Quiz (answered correctly)Spring 2023.
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uestion 1 
2 / 2 pts 
The probability of drawing one card and getting queen is 4/52. This would be considered: 
Subjective probability 
Empirical probability 
Manufactured probability 
Classical probability 
IncorrectQuestion 2 
0 / 2 pts 
Given the following information, find the probability that a randomly selected student will be 
very tall. Number of students who are very short: 45, short: 60, tall: 82, very tall: 21 
21.0% 
10.1% 
21.6% 
49.5% 
Question 3 
2 / 2 pts 
Given the following inf...
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Math 221 Week 2 Homework
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Question 1 
2 / 2 pts 
A student believes that there is a 90% probability of getting an A on the next test. This 
would be considered: 
Manufactured probability 
Classical probability 
Subjective probability 
Empirical probability 
Question 2 
2 / 2 pts 
Given the following information, find the probability that a randomly selected student will 
be very short. Number of students who are very short: 45, short: 60, tall: 82, very tall: 21 
21.0% 
39.4% 
21.6% 
28.8% 
IncorrectQuestion 3 
0 / 2 pts...
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DeVry University, Naperville MATH 221 Week 3 HW Quiz (answered correctly)
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uestion 1 
2 / 2 pts 
A student believes that there is a 90% probability of getting an A on the next test. This would be 
considered: 
Empirical probability 
Manufactured probability 
Subjective probability 
Classical probability 
Question 2 
2 / 2 pts 
Given the following information, find the probability that a randomly selected student will be 
tall, but not very tall. Number of students who are very short: 45, short: 60, tall: 82, very tall: 21 
50.5% 
39.4% 
10.1% 
49.5%
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DeVry University, Naperville MATH 221 Week 3 Quiz (answered correctly
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Question 1 
0 / 2 pts 
(CO 1) A survey of 385 people who like wild sweaters found that 74% had a wild holiday 
sweater. What is the population and what is the sample? 
Population: people who like wild sweaters: Sample: the 385 people who had a wild 
holiday sweater 
Population: people who like sweaters; Sample: the 74% that had a wild holiday sweater 
Population: people who like wild sweaters; Sample: the 385 people who like wild 
sweaters 
Population: people who like wild sweaters; Sample: the ...
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DeVry University, Naperville MATH 221 Week 3 HW Quiz (answered correctly)
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Question 1 
2 / 2 pts 
Let x represent the height of first graders in a class. This would be considered what type 
of variable: 
Discrete 
Continuous 
Nonsensical 
Lagging 
Question 2 
2 / 2 pts 
Let x represent the height of corn in Oklahoma. This would be considered what type of 
variable: 
Continuous 
Discrete 
Inferential 
Distributed 
IncorrectQuestion 3 
0 / 2 pts 
Consider the following table. 
Age Group Frequency 
18-29 9831 
30-39 7845 
40-49 6869 
50-59 6323 
60-69 5410 
70 and over 52...
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Exam (elaborations) DeVry University, Naperville MATH 221 quiz 5(Latest 2023)
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Question 1 
2 / 2 pts 
(CO 4) Consider the following table: 
Age Group Frequency 
18-29 983 
30-39 784 
40-49 686 
50-59 632 
60-69 541 
70 and over 527 
If you created the probability distribution for these data, what would be the probability of 
30-39? 
0.189 
0.237 
0.425 
0.165 
Question 2 
2 / 2 pts 
(CO 4) Consider the following table of hours worked by part-time employees. These 
employees must work in 5 hour blocks. 
Weekly hours worked Probability 
5 0.06 
15 0.61 
20 0.18 
25 0.15 
Fin...
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MATH221_W4_Lab_Excel_Adrian Arneson>MATH221 Statistics for Decision Making Week 4 Lab study guide Updated Spring 2023.
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MATH221 Statistics for Decision Making 
Week 4 Lab 
Name: _______ Adrian Arneson ________________ 
Statistical Concepts: 
 Probability 
 Binomial Probability Distribution 
Calculating Binomial Probabilities 
NOTE: For question 1, you will be using the same data file your instructor gave you 
for the Week 2 Lab. 
1. Using the data file from your instructor (same one you used for the Week 2 Lab), 
calculate descriptive statistics for the variable (Coin) where each of the thirty-five 
student...
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Exam (elaborations) MATH 221 Week 5 Homework well explained 2023 latest
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Question 1 
2 / 2 pts 
From a random sample of 58 businesses, it is found that the mean time 
the owner spends on administrative issues each week is 20.53 with a 
standard deviation of 3.54. What is the 95% confidence interval for 
the amount of time spent on administrative issues? 
 (19.24, 24.14) 
 (16.99, 24.07) 
 (13.45, 27.61) 
X (19.62, 21.44) 
Question 2 
2 / 2 pts 
If a confidence interval is given from 43.85 up to 61.95 and the mean 
is known to be 52.90, what is the maximum error? 
 X9...
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DeVry University, Naperville MATH 221 Math 221 Week 7 Quiz
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Question 1 
2 / 2 pts 
(CO6) From a random sample of 55 businesses, it is found that the mean time that 
employees spend on personal issues each week is 5.8 hours with a standard deviation 
of 0.35 hours. What is the 95% confidence interval for the amount of time spent on 
personal issues? 
(5.74, 5.90) 
(5.73, 5.87) 
(5.72, 5.88) 
Correct! 
(5.71, 5.89) 
Question 2 
0 / 2 pts 
(CO6) If a confidence interval is given from 8.54 to 10.21 and the mean is known to be 
9.375, what is the maximum erro...
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