Math 221 Samenvattingen, Aantekeningen en Examens
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MATH 221 TOP Exam Questions and CORRECT Answers
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From a random sample of 58 businesses, it is found that the mean time the owner spends on 
administrative issues each week is 21.69 with a population standard deviation of 3.23. What 
is the 95% confidence interval for the amount of time spent on administrative issues? 
A. (19.24, 24.14) 
B. (21.78, 22.60) 
C. (20.86, 22.52) 
D. (20.71, 22.67) C. (20.86, 22.52) 
If a confidence interval is given from 45.82 up to 55.90 and the mean is known to be 50.86, 
what is the margin of error? 
2.52 
5.0...
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MATH 221 Test 1 with Complete Solutions
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Statistics - ANSWER-The scientific discipline that provides methods to help us make sense of data 
 
Population - ANSWER-The entire collection of individuals or measurements about which information is desired 
 
Sample - ANSWER-A part of the population selected for study 
 
Descriptive Statistics - ANSWER-The branch of statistics that includes numerical, graphical, and tabular methods for organizing and summarizing data 
 
Inferential Statistics - ANSWER-The branch of statistics that includes me...
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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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MATH 221 UPDATED Test Questions and CORRECT Answers
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If A is an m × n matrix and if the equation Ax=b is inconsistent for some bb in Rm, then A 
cannot have a pivot position in every row.True 
If the equation Ax=b is inconsistent, then b is not in the set spanned by the columns of 
A.True 
If A is an m × n matrix whose columns do not span Rm, then the equation Ax=b is 
inconsistent for some b in Rm.True 
Any linear combination of vectors can always be written in the form Ax for a suitable matrix 
A and vector x.True 
The equation Ax=b is con...
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Math 221c TOP Exam Questions and CORRECT Answers
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The City of Rexburg reports that the nitrate concentration in the city's drinking water supply 
is between 1.59 and 2.52 ppm (parts per million,) and values outside of this range are 
unusual. We will assume μ−2σ=1.59 ppm and μ+2σ=2.52 ppm. It is reasonable to assume the 
measured nitrate concentration is normally distributed. Estimate the mean of the measured 
nitrate concentration in Rexburg's drinking water.(1.59+2.52)/2= 4.11/2= 2.055 
Curvature Residual PlotIf the residual plot ...
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MATH 221 W2 Questions with Correct Answers
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A random number generator is used to select a number from 1 to 100. What is the probability of selecting an even number? Correct Answer 0.50 
 
What is the sample space of rolling two four-sided die? Correct Answer (1,2)(1,3)(1,4)(2,2)(2,3)(2,4)(3,4)(4,4) 
 
Consider the table below 
Response (number of cats owned); None One, Two, Three, Four or more 
Frequency; 659, 329, 52, 13, or 8 
What is the probability that the next person asked has four or more cats? Correct Answer Less than 1% 
 
Consid...
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MATH 221 Test 1 Questions And Answers With Complete Solution
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MATH 221 Test 1 Questions And Answers With Complete Solution 
Statistics - CORRECT ANSWERS The scientific discipline that provides methods to help us make sense of data 
 
Population - CORRECT ANSWERS The entire collection of individuals or measurements about which information is desired 
 
Sample - CORRECT ANSWERS A part of the population selected for study 
 
Descriptive Statistics - CORRECT ANSWERS Th...
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Math 221 Week 2 Homework Answer key Updated Spring 2023.
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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: 
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
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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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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...