Exam (elaborations)
Solution Manual: Analysis of Categorical Data with R 1st Edition by Bilder - Ch. 1-6
- Course
- Institution
- Book
Solution Manual: Analysis of Categorical Data with R 1st Edition by Bilder - Ch. 1-6
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Solution Manual: Analysis of Categorical Data with R 1st Edition by Bilder - Ch. 1-6
-
Solution Manual: Analysis of Categorical Data with R 1st Edition by Bilder - Ch. 1-6
Seller
Follow
phinta004
Reviews received
Content preview
Solution Manual: Analysis of Categorical Data with R 1stEdition by Bilder - Ch. 1-6, 9781439855676, with Rationales
What is the purpose of data analysis?
- To sample data wherever it's found
- To quantify existing data
- To archive data effectively
- To gather insights from raw data - ANSWER: - To gather insights from raw data
To combine functions, use the ________________:
- parentheses
- slash
- pipe operator
- two commas - ANSWER: - pipe operator
Which of the following is NOT true?
- Data formatting ensures that data is consistent and easily understandable.
- In statistics, coherence is an indication of the quality of the information in a single data set.
- Fully coherent data is consistent and can be reliably combined for analysis.
- In a data set, data is usually collected from a single source and stored in a single format. - ANSWER: -
In a data set, data is usually collected from a single source and stored in a single format.
Which of the following is NOT a reason to perform data normalization?
- Enable a fair comparison between different features
- Make some analyses easier
- Minimize the effects of outliers
- Eliminate outliers - ANSWER: - Eliminate outliers
What are descriptive statistics?
- A shallow analysis of data that tells very little about it
- A way of relating different data sets
- A method for showing some basic features of a data set
- A method for revealing details about a data set - ANSWER: - A method for showing some basic
features of a data set
What is the purpose of an ANOVA test?
- It helps find correlations between different groups of a categorical variable.
- It helps compare correlating categories in different data sets.
- It determines which variable is most statistically significant.
- It is not a useful test except in certain specific cases. - ANSWER: - It helps find correlations between
different groups of a categorical variable.
Which of the following is NOT true about a model?
- A model cannot predict a value given only one other value.
- Models work by relating one or more independent variables to dependent variables.
- The more data you have, the more accurate your model will be. x
- Different types of models may be more accurate in different situations. - ANSWER: - Models work by
relating one or more independent variables to dependent variables.
A positive correlation is one in which _______________.
- a causative relationship is shown x
- both variables move in the same direction x
- only one variable moves
- both variables move in opposite directions - ANSWER: - only one variable moves
, Which is NOT true for comparing multiple linear regression (MLR) and simple linear regression (SLR)?
Polynomial regression will have a smaller MSE than regular regression.
A lower mean squared error (MSE) always implies a better fit.
R2 will have a smaller MSE.
The MSE for an MLR model will be smaller than the MSE for an SLR model. - ANSWER: A lower mean
squared error (MSE) always implies a better fit.
A testing set is _________.
a selected portion of the data set that is known to function well within the model
multiple data sets that have been run on the model
a large portion of a data set that is used to build a sound model
a small portion of a data set that is used to see whether a model works - ANSWER: a small portion of a
data set that is used to see whether a model works
Which of the following is NOT true?
Coherence is irrelevant when assessing the quality of a data set.
Data formatting ensures that data is consistent and easily understandable.
Data is collected from different sources and may be stored in different formats.
Fully coherent data is consistent and can be reliably combined for analysis. - ANSWER: Coherence is
irrelevant when assessing the quality of a data set.
What is the F-test score?
It measures level of confidence in results.
It is the variance between sample group means divided by variance within the sample group.
If it is small, it indicates a strong correlation between variable categories and the target variable.
It's a measure of whether variance is statistically significant. x - ANSWER: It is the variance between
sample group means divided by variance within the sample group.
Which of these is NOT a method for normalizing data?
Simple feature scaling
Compound Y
Z-score
Min-max - ANSWER: Compound Y
Which of the following is NOT a task facilitated by R?
Model evaluation
Data generation
Model development
Data cleaning - ANSWER: Data generation
Functions contained in packages such as dplyr are used to:
Prevent unwanted operations
Identify users of the data set
Select a data set to use
Perform common operations - ANSWER: Perform common operations
What does a P-score measure?
It is the ratio of variance between group means over the variance within each of the sample group
means.
If it is large, it indicates a strong correlation between variable categories and the target variable.
It indicates whether the ANOVA test result is statistically significant.
It indicates the validity of data within a data set - ANSWER: It indicates whether the ANOVA test result
is statistically significant.
Data analysis plays an important role in which of the following scenarios? Select 3 answers.
Finding data.
Predicting the future.
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 phinta004. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79223 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now