WorksheetsMidterms in EDA
Total questions: 50
Worksheet time: 40mins
These are facts and statistics collected together for reference or analysis.
Data
Object
Questionnaire
Survey
Which of the following is NOT true about the importance of data?
Data empowers you to make informed decisions.
Data helps you identify problems.
Data helps you cover the actual problems.
Data will back up your arguments.
It is a type of data which cannot be ordered in a logical or natural way.
primary data
secondary data
quantitative data
qualitative data
Data gathered from studies, surveys, or experiments that have been run by other people or for other research.
primary data
secondary data
quantitative data
qualitative data
A set of printed or written questions with a choice of answers, devised for the purposes of a survey or statistical study.
experiment
questionnaire/ surveys
observations
focus group
A test done before and after applying an intervention to a target population.
diagnostic test
pre-test and post-test
survey
laboratory test
Existing databases include census data, knowledge/attitude/behavior (KAB) studies, criminal justice statistics, performance data, non-confidential client information, agency progress reports, etc. What kind of data is the existing database?
personal data
tertiary data
primary data
secondary data
Data which is collected routinely, without a researcher designing a survey or conducting an experiment.
pre-test
existing databases
observations
in-depth interviews
A demographically diverse group of people and whose reactions are studied to determine the reactions that can be expected from a larger population.
in-depth interview
focus groups
conference
convention
Which of the following steps should not be done by a researcher before conducting a survey?
Gather a sample list of potential participants that matches the population of interest as closely as possible.
Schedule the sending of the initial letter, the launching of the survey instrument, and the sending of the follow-up letter.
Distribute the survey form as soon as possible.
Develop a clear and concise purpose statement.
Which of the following steps should a researcher do after completing the survey administration phase?
Use a professional tone and a business format for all survey correspondence.
Each survey received will be examined for completeness.
Write so as to demonstrate respect for participants’ time and regard for their opinions.
Assure participants of their confidentiality or anonymity.
It is the first step in conducting an experiment.
Formulate a hypothesis and make a prediction.
Choose the variables.
State your question.
Choose a control.
It is a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation. It is also known as an 'educated guess.'
guess
hypothesis
inference
conclusion
A variable that stands alone and isn't changed by the other variables you are trying to measure.
dependent variable
independent variable
controlled variable
unmeasured variable
The purpose of a __________ variable is to keep all conditions as similar as possible between two subjects except for the independent variable.
dependent
independent
controlled
unmeasured
It is a collection of methods for planning experiments, obtaining data, and analyzing, interpreting, and drawing conclusions on the data.
Statistics
Data
Variable
Population
What is the purpose of statistics?
To plan experiments
To obtain data
To analyze and interpret data
All of the above
What is the definition of data?
Methods for planning experiments
Collection of information
Variable in an experiment
Entire group being studied
What is a variable in statistics?
A method for planning experiments
A collection of information
A factor that can change in an experiment
The entire group being studied
It is a subgroup of population
data
variable
population
sample
A variable that that represent an amount or a count.
Qualitative variables
Discrete variables
a. Quantitative variables
Continuous variables
What do you mean the term SRS?
Sample random sampling
Simple random sampling
Stratified random sampling
None of the above
Probability can be written as a
fraction
percent
decimal
all of the above
Probability is defined as...
...the likelihood that an event will occur.
...a game that involves coins.
...a guarantee.
Classify: Height of a plant measured each day for 30 days.
Discrete
Continuous
What makes a probability distribution uniform?
When all possible outcomes have an equal chance or probability of occurring.
When the graph is a straight line with at any angle.
When the outcomes are discrete.
When the outcomes are continuous.
The number of points scored in a basketball game is
a discrete random variable.
a continuous random variable.
is not a random variable.
A sample space is
collection of all possible outcomes
average of all possible outcomes
list of only the most likely outcomes
only the observed outcomes
Two events are mutually exclusive if:
Their probabilities are less than 1.
Their probabilities sum to 1.
Both events cannot occur at the same time.
They contain Every possible outcome of an experiment.
Which of the following distributions is discrete?
Binomial
Exponential
Normal
All of the above
The first step in exponential smoothing forecasting should be to use naïve model.
True
False
For any two statistically independent events, P(A or B) = P(A) + P(B).
True
False
Probability distribution are always based on subjective beliefs about what should happen.
True
False
A numeric description of the outcome of an experiment.
Continuous random variable
Discrete random variable
Random variable
Expected value
Although physical in form, it does not have a physical appearance similar to the real object or situation it represents.
Iconic model
Mathematical model
Analog model
Super model
A representation of a real object or situation.
Problem
Variable
Probability
Model
The probability distribution for a discrete random variable, used to compute the probability of x occurrences over a specified interval.
Normal probability distribution
Poisson probability distribution
Standard normal distribution
Exponential probability distribution
The number of periods one should use in a moving average model may be determined by statistical equations.
True
False
Random variables are numerical values corresponding to each possible outcome of an experiment and are between 0 and 1.
True
False
For a discrete random variable such as Poisson random variable, the expected value is always a nonnegative number.
True
False
Events that have no sample points in common.
Ven diagram
Mutually exclusive events
Joint probability
none of the above
If you were to use exponential smoothing with an alpha equals to zero, your forecasts would remain constant from period to period.
True
False
Arrivals at a service facility are generally described by the:
Normal distribution
Binomial distribution
Poisson Distribution
None of the above
The symbol P(AB) denotes a:
Marginal probability
Joint probability
Conditional probability
Classical probability
A time series is a set of data collected at:
Random intervals
Regular intervals
Convenient intervals
All of the above
In a time-series regression model, the dependent variable is sales and the independent variable is:
Price
Seasonality
Trend
Some function of time
A physical replica, or representation, of a real object.
Iconic model
Mathematical model
Analog model
Super model
The process of defining the problem, identifying the alternatives, determining the criteria, evaluating the alternatives, and choosing the alternative.
Problem Solving
Decision making
Subjective judgement
Statistical analysis
A continuous probability distribution that is useful in describing the time to complete a task or the time between occurrences of an event.
Normal probability distribution
Poisson probability distribution
Standard normal distribution
Exponential probability distribution
