MATH221 Final Exam
(TCO 9) The hours of study and the final exam grades have this type of relationship:
ŷ = 5.76(hours) + 35.31. Based on this linear regression equation, estimate the expected
grade for a student spending 8 hours studying. Round your answer to two decimal places.
Points :
46.08
CORRECT
81.39 ANSWER
91.45
85.29
Instructor Explanation: Textbook Chapter 9, page 504, and the Week 2 Lecture
(TCO 5) At a drive through window of a bank it’s found that 10 customers get served every
15 minutes. The bank’s manage is interested in finding a way to increase the number of
customers that can be served. He thought that knowing the probability of serving 12
customers per 15 minutes could be helpful
to him in the decision making process. Choose the best answer of the following:
Points :
CORRECT
This is an example of a Poisson probability experiment
ANSWER
This is an example of a Binomial probability experiment
This is neither a Poisson nor a Binomial probability
experiment Not enough information to determine the
type of experiment
Instructor Explanation: Ch4: binomial and Poisson distribution concepts.
(TCO 5) Microfracture knee surgery has a 75% chance of success on patients with
degenerative knees. The surgery is performed on 5 patients. Find the probability of the
surgery being successful on 3 or 4 patients?
Points :
0.103516
CORRECT
0.659180
Page 1 of 16
, ANSWER
0.762695
0.64287
5
Ch-4 by the Binomial distribution formula we get: P(x=3 OR
Instructor x=4)=P(3)+P(4)= 0.263672
Explanation: + 0.395508=0.659180
Page 2 of 16
, (TCO 5) It has been recorded that 10 people get killed by shark attack every year. What is
the probability of having 5 or 6 people get killed by shark attack this year?
Points :
0.130141
0.026484
CORRECT
0.100889
ANSWER
0.06708
6
Ch-4 By the Poisson distribution formula we get: P(x=5 OR
Instructor x=6)=P(5)+P(6)= 0.037833
Explanation: 0.063055=0.100889
(TCO 2) The median teaching hours for a full time faculty at a state university is eight hours
per week. What does this tell you about the typical teaching hours for full time faculty at
that university?
Points :
Half of the full time faculties teach less than eight hours per week CORRECT
while half teaches more than eight hours per week.
ANSWER
The average teaching hours for full time faculty is eight hours per week.
More full time faculty teaches eight hours per week than any other
number of teaching hours.
The number of teaching hours for full time faculty in not very
consistent because eight is such a low number.
Instructor Explanation: Textbook Chapter 2 Page 68, week 1 lecture
(TCO 6) Assuming that the data are normally distributed with a mean of 45 and a
standard deviation of 3.25, what is the z-score for a value of 40?
Points :
1.54
2.38
-1.36
CORRECT
-1.54 ANSWER
Page 3 of 16
(TCO 9) The hours of study and the final exam grades have this type of relationship:
ŷ = 5.76(hours) + 35.31. Based on this linear regression equation, estimate the expected
grade for a student spending 8 hours studying. Round your answer to two decimal places.
Points :
46.08
CORRECT
81.39 ANSWER
91.45
85.29
Instructor Explanation: Textbook Chapter 9, page 504, and the Week 2 Lecture
(TCO 5) At a drive through window of a bank it’s found that 10 customers get served every
15 minutes. The bank’s manage is interested in finding a way to increase the number of
customers that can be served. He thought that knowing the probability of serving 12
customers per 15 minutes could be helpful
to him in the decision making process. Choose the best answer of the following:
Points :
CORRECT
This is an example of a Poisson probability experiment
ANSWER
This is an example of a Binomial probability experiment
This is neither a Poisson nor a Binomial probability
experiment Not enough information to determine the
type of experiment
Instructor Explanation: Ch4: binomial and Poisson distribution concepts.
(TCO 5) Microfracture knee surgery has a 75% chance of success on patients with
degenerative knees. The surgery is performed on 5 patients. Find the probability of the
surgery being successful on 3 or 4 patients?
Points :
0.103516
CORRECT
0.659180
Page 1 of 16
, ANSWER
0.762695
0.64287
5
Ch-4 by the Binomial distribution formula we get: P(x=3 OR
Instructor x=4)=P(3)+P(4)= 0.263672
Explanation: + 0.395508=0.659180
Page 2 of 16
, (TCO 5) It has been recorded that 10 people get killed by shark attack every year. What is
the probability of having 5 or 6 people get killed by shark attack this year?
Points :
0.130141
0.026484
CORRECT
0.100889
ANSWER
0.06708
6
Ch-4 By the Poisson distribution formula we get: P(x=5 OR
Instructor x=6)=P(5)+P(6)= 0.037833
Explanation: 0.063055=0.100889
(TCO 2) The median teaching hours for a full time faculty at a state university is eight hours
per week. What does this tell you about the typical teaching hours for full time faculty at
that university?
Points :
Half of the full time faculties teach less than eight hours per week CORRECT
while half teaches more than eight hours per week.
ANSWER
The average teaching hours for full time faculty is eight hours per week.
More full time faculty teaches eight hours per week than any other
number of teaching hours.
The number of teaching hours for full time faculty in not very
consistent because eight is such a low number.
Instructor Explanation: Textbook Chapter 2 Page 68, week 1 lecture
(TCO 6) Assuming that the data are normally distributed with a mean of 45 and a
standard deviation of 3.25, what is the z-score for a value of 40?
Points :
1.54
2.38
-1.36
CORRECT
-1.54 ANSWER
Page 3 of 16
