WPC 300 FINAL EXAM QUESTIONS WITH REVISED ANSWERS ALL CORRECT
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Course
WPC 300
Institution
WPC 300
WPC 300 FINAL EXAM QUESTIONS WITH REVISED ANSWERS ALL CORRECT
When sample size increases - Answer- Confidence interval decreases
Which of the following proposition describes an existing theory or belief? - Answer- Null hypothesis
Which of the following is not a continuous random variable?...
WPC 300 FINAL EXAM QUESTIONS
WITH REVISED ANSWERS ALL
CORRECT
When sample size increases - Answer- Confidence interval decreases
Which of the following proposition describes an existing theory or belief? - Answer- Null
hypothesis
Which of the following is not a continuous random variable? - Answer- The outcomes of
rolling two dice
In order to reject the null hypothesis, the p-value must be less than the - Answer- Alpha
The central limit theorem states that if the population is normally distributed, then the -
Answer- Sampling distribution of the mean will also be normal for any sample size
Which of the following is a difference between the t-distribution and the standard normal
(z) distribution? - Answer- The t-distribution has a larger variance than the standard
normal distribution
Which of the following is a Type-II error? - Answer- The research hypothesis is actually
true, and the test incorrectly fails to rejects null hypothesiss
You arrived at a significant test statistic (p-value < 0.05) when comparing responses
from three treatment groups in a one-way ANOVA. How would you interpret the
alternative hypothesis for this test?
Correct! - Answer- The mean response from at least one treatment group is different
from that of the others
In data extraction process for an ETL tool, which of the following is not an example of
legit data source? - Answer- Competitions data (you wouldn't have access to this)
Which of the following category of data mining would you would use for Spam filtering of
emails? - Answer- Supervised
Which of the following is a definition of distance between two clusters in a single linkage
clustering? - Answer- The distance between the least distant pair of objects, one from
each group
, Which of the following is not an application of clustering analysis? - Answer- Crime
prediction analysis
Which of the following is the first stage of agglomerative hierarchical clustering? -
Answer- By joining two clusters that are closest to each other
In loading phase of an ETL tool, the transformed data gets loaded into an end target
usually the ____________. - Answer- Data warehouse
In the target story discussed in the lecture, why did Target send the teen daughter
maternity ads? - Answer- Target analytics model suggested she was pregnant based on
her buying habit
Which of the following is true of hierarchical clustering? - Answer- The data partition
does not occur in a single step
Which of the following steps is not used in the k-means clustering algorithm?
Correct! - Answer- Select cluster centers in such a way that they are as closest as
possible from each other.
The correlation coefficient between the age of an auto and the money spent to repair is
0.8. Which of the following statement is true? - Answer- 64% of the variation in the
money spent on repairs is explained by the age of the auto (R=0.8, R-squared = 0.64.
Remember the definition of R-squared)
A correlation coefficient between the "college entrance exam" grades and "scholastic
achievement" was found to be 1.08. On the basis of this, you would tell the university
that: - Answer- They should hire a new statistician (can't be above one ( -1< r< 1 ) )
Which of the following assumptions is not true for simple linear regression? - Answer-
Multicollinearity effect between independent variabels
The unexplained variance in the regression analysis is also known as: - Answer-
Residual variance
Which of the following is true about multi-collinearity? - Answer- Is measured using the
statistical variance inflation factor (VIF)
Predictive analytics may be applied to_______________, which is a set of techniques
that use descriptive data and forecasts to identify the decisions most likely to result in
the best performance. - Answer- Prescriptive analytics
Experimentation is a way of - Answer- Analytical thinking
Gamblers' fallacy is ______________ - Answer- A Clustering illusion
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