Exam (elaborations)
BIDA 630 Data Analytics Final exam with complete solutions 2024_2025.
- Course
- Institution
BIDA 630 Data Analytics Final exam with complete solutions 2024_2025.
[Show more]
Content preview
BIDA 630 Data Analytics Final exam withcomplete solutions 2024/2025
Identify whether the task required is supervised or unsupervised learning:
Predicting whether a company will go bankrupt based on comparing its financial
data to those of similar bankrupt and non bankrupt firms. - ANSWER- Supervised
learning, all information evaluated is known
Identify whether the task required is supervised or unsupervised learning:
Printing of custom discount coupons at the conclusion of a grocery store
checkout based on what you just bought and what others have bought
previously. - ANSWER- Unsupervised learning; outcomes are unknown
True or false: The test data are used to build models, or to further tweak the
model or improve its fit. - ANSWER- False
_____________ is used for assessing the performance of the final chosen model
on new data - ANSWER- The test data partition
When a model is fit to training data, zero error with those data is not necessarily
good. This special case is called ______. - ANSWER- Overfitting
True or false: Bar charts are useful for comparing a single statistic (e.g. average,
count, percentage) across groups. The height of the bar represents the value of
statistic, and different bars correspond to different groups. - ANSWER- True
Which of the following are the most popular visualization tools in JMP_Pro? -
ANSWER- Graph Builder, Fit Y by X, Distribution
, Scatter plots play important role in prediction. Next step can be developing a
model. Scatter plots provide information about relationships (linear or non-linear)
between variables. The variables in scatter plot ________. - ANSWER- Numerical
In a box plot, the box include %50 of the data, the horizontal line represents
(i)____________, the top and bottom of the box represent (ii)________,
respectively. - ANSWER- (i) the Median (50th percentile); (ii) the 75th and 25th
percentiles
In JMP a diamond is displayed in the box, where the center of the diamond is
_________. - ANSWER- The mean
The density ellipsoid in scatterplot matrix is a good graphical indicator of the
correlation between two variables. The ellipsoid collapses diagonally as the
correlation between the two variables approaches either 1 or -1.
The ellipsoid is more circular if the two variables are more correlated. (TRUE or
FALSE?) - ANSWER- False; The ellipsoid is more circular (less diagonally
oriented) if the two variables are less correlated
True or False: Sensitivity and Specificity are plotted on an ROC Curve. -
ANSWER- True
To obtain an honest estimate of future classification error, we use the
classification matrix that is computed from ________. - ANSWER- Validation data
True or False: The classification matrix, also called confusion matrix, gives
estimates of the true classification and misclassification rates. - ANSWER- True
How do you calculate the error rate on a classification matrix (Confusion Chart)? -
ANSWER- Total incorrect predictions / total predictions
The 'portion' of a lift curve represents what percent of the data, and how is this
portion sorted? - ANSWER- The portion (portion = .2 = p) represents the top p%
(20%) of the data, as sorted by their predicted probability of predictor
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller tuition. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67866 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now