MSIS 3223 Test 2 Training Exam Questions And All Correct Answers.
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MSIS 3223
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MSIS 3223
Which of the following is true of normal distributions? - Answer The Mean, median and mode are all equal
Probability is the likelihood that an outcome occurs.T/F - Answer True
The union of two events contains all outcomes that belong to either of the two events. T/F - Answer True
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MSIS 3223 Test 2 Training Exam
Questions And All Correct Answers.
Which of the following is true of normal distributions? - Answer The Mean, median and mode are all
equal
Probability is the likelihood that an outcome occurs.T/F - Answer True
The union of two events contains all outcomes that belong to either of the two events. T/F - Answer
True
Conditional probability is the probability of occurrence of one event 'A' given that another event 'B' is
known to be true or has already occurred. T/F - Answer True
A probability distribution is the characterization of the possible values that a random variable may
assume along with the probability of assuming these values. T/F - Answer True
A random variable is a numerical description of the outcome of an experiment. T/F - Answer True
The expected value of a random variable corresponds to the notion of the median for a sample. T/F -
Answer False
The normal distribution is a continuous distribution that is described by the familiar bell-shaped curve
and is perhaps the most important distribution used in statistics. T/F - Answer True
The triangular distribution is defined by three parameters: the mean, median, and mode. T/F - Answer
False
, Variance calculates the probability of a random variable lying within a certain interval. T/F - Answer
True
True or False
Regression analysis is a tool for building mathematical and statistical models that characterize
relationships between a dependent (ratio) variable and one or more independent, or explanatory
variables (ratio or categorical), all of which are numerical. T/F - Answer True
Regression models of ____ data focus on predicting the future.
a. time-series
b. panel
c. cross sectional
d. missing - Answer a. time-series
In predictive analysis models, a second-order polynomial has only one hill or valley. T/F - Answer True
Excel's Trendline feature cannot be used in modeling trends which include time variables. T/F - Answer
False
Creating a scatter chart with an added trendline is visually superior to the scatter chart
generated by line fit plots. T/F - Answer True
The standard error may be assumed to be large if the data are clustered close to the regression line. T/F -
Answer False
A good regression model has the fewest number of explanatory variables providing an adequate
interpretation of the dependent variable. T/F - Answer True
Regression analysis is a tool for building mathematical and statistical models that characterize
relationships between a dependent variable and one or more independent, or explanatory, variables. T/F
- Answer True
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