Statistics math 221 - Study guides, Class notes & Summaries
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MATH 221 FINAL STUDY-Statistics with Complete Solutions
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Difference between categorical and quantitative data - ANSWER-Quantitative variables provide numerical information. 
Categorical variables yield data that can only be considered as categories. 
 
Differences in the definitions of a Parameter, Population, Statistic and a Sample - ANSWER-Parameter: Numbers that summarize data from a population 
Population: Entire collection of a group 
Statistic: The probability of obtaining a result or numbers that summarize the data from a sample 
Sample: A man...
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MATH 225N: Week 7 Assignment Developing Hypothesis and understanding Possible Conclusion for Proportions (Q&A) Latest Update
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MATH 225N: Week 7 Assignment Developing Hypothesis and understanding Possible Conclusion for Proportions (Q&A) Latest Update. 
Identify the null and alternative hypotheses for an experiment with one population proportion 
Question 
Devin is a researcher for a pharmaceutical company testing whether a new 
prescription pain medication causes patients to develop nausea. The medication 
would have to be scrapped if more than 6% of patients who take the medication 
develop nausea on a regular basis. ...
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ATH221_W2_Lab_Excel_Adrian Arneson/MATH221 Statistics for Decision Making Week 2 Lab
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Week 2 Lab Instructions-BEGIN 
 Data have already been formatted and entered into an Excel worksheet. 
 Obtain the Lab data file (Excel) for this lab from your instructor. 
 Use the Week 1 spreadsheet (available from Week 1: Resources) for graphs and 
calculations. You will need to copy data from the Lab data file into the Week 1 
calculations spreadsheet to answer some of these Lab questions. 
 The names of each variable from the survey are in the first row of the Lab data 
Workshee...
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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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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 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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DeVry University, Naperville MATH 221 quiz (Latest 2023)
- Exam (elaborations) • 19 pages • 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...
-
DeVry University, Keller Graduate School of Management_MATH 221Week 7 quiz (Latest 2022/2023)
- Exam (elaborations) • 18 pages • 2023
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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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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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DeVry University, Naperville MATH 221 Week 3 HW Quiz (answered correctly)
- Exam (elaborations) • 11 pages • 2023
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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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