C207 Final Self Assessments 2021

Final Self-Assessment

Question 1

Amanda is measuring the temperature. She looks at the thermometer and sees that it is somewhere
between 65 and 66 degrees Fahrenheit. She is okay with the temperature in between two integers because
she knows temperature is not ________ data, but temperature is _________ data.

 a) Nominal, Ordinal


 b) Nominal, Discrete


 c) Continuous, Discrete


 d) Discrete, Continuous

Feedback: The correct answer is D. Temperature is not a measure that comes in increments (discrete) but
is continuous as a temperature can be any number within a range.

Question 2

The first stage of Davenport and Kim's Three-Stage Model of quantitative decision making is to

 a) communicate the results.


 b) frame the problem.


 c) solve the problem.


 d) None of the above.

Feedback: The correct answer is B. It is important to frame the problem by understanding the
environment of a problem. After that, one can solve the problem and communicate the results to others.

Question 3

A manager is looking at his previous quarter and determining the causes for the sudden sales spike to gain
a better understanding of the actions and outcomes. If using analytics, which kind of analytics would the
manager use?

 a) Predictive Analytics

, b) Prescriptive Analytics


 c) Descriptive Analytics


 d) Proactive Analytics

Feedback: The correct answer is C. The manager should use descriptive analytics because it is used to
describe the characteristics of what is being studied. In this situation, the previous quarter sales would be
studied.

Question 4

In a study of cancer treatments, the subjects and the treatment allocator (who is also the data gatherer) are
unaware of which treatment is being given to which subject. This is a ____________ study.

 a) Double-Blind


 b) Triple-Blind


 c) Information-biased


 d) Response-biased

Feedback: The correct answer is A. There are two layers being blinded in this study. If the treatment
allocator and the data gatherer were different people, then this would be a triple-blind study. There is no
stated bias.

Question 5

Adam is measuring the temperature as the lake outside his office is freezing over. He measures the
temperatures in Fahrenheit ten times with the same thermometer and gets the following results: 20, 21,
21, 20, 20, 19, 19, 21, 20, 19. Is his thermometer reliable? Is it valid?

 a) Reliable and Valid


 b) Reliable but not Valid


 c) Not Reliable but Valid


 d) Not Reliable or Valid

, Feedback: The correct answer is B. The thermometer consistently gives about the same number for the
freezing point and therefore is reliable. It is not valid because it does not accurately measure what it is
trying to measure. We know this because we know water freezes at 32 degrees Fahrenheit.

Question 6

Toby is trying to determine the number of people at today's parade in order to determine the impact of
advertising at parades. He asks a number of different people leaving the parade their projected number of
attendants. He gets the following responses: 70,000; 450,000; 2,000; 130,000; 3,000,000; 75,000;
200,000; 800,000; 150,000; and 210,000. Is this survey reliable? Is it valid?

 a) Reliable and Valid


 b) Reliable but not Valid


 c) Not Reliable but Valid


 d) Not Reliable or Valid

Feedback: The correct answer is D. The answers are not consistent and do not accurately measure the
number of people. Therefore it is not reliable or valid.

Question 7

Harry is doing a survey of the city of Los Angeles' population. He is wondering everyone's favorite food.
He sends out a survey to all of the renters in the city and receives basically all of the surveys back in the
mail. What is the flaw in this experiment?

 a) Small Sample Size


 b) Blinding


 c) Truly Representative Sample


 d) Association vs. Causation

Feedback: The correct answer is C. This does not represent the entire population that Harry is concluding
about as he did not get responses from the other samples such as homeowners in Los Angeles.

Question 8

Tom Brady is on the street in Chicago. He is asking anyone he meets if they prefer Tom Brady or Peyton
Manning. The survey results show that people greatly prefer Tom Brady. What is the flaw in this
experiment?

,  a) Small Sample Size


 b) Truly Representative Sample


 c) Response Bias


 d) Conscious Bias

Feedback: The correct answer is C. It is response bias, as the respondents might be responding believing
that Tom Brady wants to hear that they prefer him over Peyton Manning. This is not Conscious bias as
conscious bias would be in the way Tom Brady is asking a question and this scenario does not indicate
any bias in that way.

Question 9

There is a 50 percent chance that the president will slip on a banana peel. Also, there is a 25 percent
chance that the president will be hit in the face with an apple. There is a 10 percent chance that the
president will slip on a banana peel and get hit in the face with an apple. What is the likelihood that the
president has a run-in with at least one of these fruits?

 a) 65%


 b) 85%


 c) 35%


 d) 22.50%

Feedback: The correct answer is A. This is a union between P(banana) and P(apple). Therefore,
P(banana ∪

apple) =P(banana)+P(apple)−P(banana∩apple) =0.50+0.25−0.10=0.65=65%

. The president will probably not have a great week.

Question 10

There is a 20 percent chance that Charlie's company will merge with another company. If there is a
merger, there is an 80 percent chance Charlie will have to fire three people from his team. There is a 15
percent chance Charlie will have to fire three people from his team no matter what. What is the likelihood
there will be a merger, and Charlie will have to fire three people from his team?

 a) 16%