Q&A Hub

Get support from your instructors, build positive interactions with fellow data science students, and have fun while advancing in data science. Read our Community Guidelines.

Ask a question
qa.jpg
Filter courses
  • Introduction to Tableau
  • The Complete Data Visualization Course with Python, R, Tableau, and Excel
  • Introduction to R Programming
  • Data Preprocessing with NumPy
  • Introduction to Data and Data Science
  • Data Cleaning and Preprocessing with pandas
  • Introduction to Business Analytics
  • Data Analysis with Excel Pivot Tables
  • SQL
  • Credit Risk Modeling in Python
  • Python Programmer Bootcamp
  • SQL + Tableau + Python
  • Introduction to Jupyter
  • Statistics
  • Mathematics
  • Introduction to Excel
  • Probability
  • Starting a Career in Data Science: Project Portfolio, Resume, and Interview Process
  • SQL + Tableau
  • Time Series Analysis with Python
  • Power BI
  • Product Management for AI & Data Science
  • Git and GitHub
  • Deep Learning with TensorFlow 2
  • Customer Analytics in Python
  • Web Scraping and API Fundamentals in Python
  • Introduction to Python
  • Python for Finance
  • Machine Learning in Python
  • Advanced Microsoft Excel
  • Convolutional Neural Networks with TensorFlow in Python
  • Data Strategy
  • Fashion Analytics with Tableau
  • Dates and Times in Python
  • SQL for Data Science Interviews
  • Data Literacy
  • AI Applications for Business Success
  • Linear Algebra and Feature Selection
  • Machine Learning with Naïve Bayes
  • Machine Learning in Excel
  • Machine Learning with Support Vector Machines
  • A/B Testing in Python
  • Machine Learning with Decision Trees and Random Forests
  • Machine Learning with K-Nearest Neighbors
  • Machine Learning with Ridge and Lasso Regression
  • Data-Driven Business Growth
  • Corporate Strategy
  • Marketing Strategy
  • Negotiation
  • Management
  • Persuasion and Influence
  • Excel for Project Management
  • Agile and Scrum Project Management
  • Project Management
  • Blockchain for Business
  • How to Think Like a Data Scientist to Become One
  • Power Query and Data Modeling
  • Introduction to DAX
  • Building Business Reports Using Power BI
  • The Machine Learning Process A-Z
  • Working with Text Files in Python
  • Intermediate Python Programming
  • Advanced SQL
  • Select all
Filter questions by
  • Select all
  • Answered
  • Resolved
Clear all
Order by
  • Posted on
  • Last answered
  • Answers
  • Popularity
Filter courses
  • Introduction to Tableau
  • The Complete Data Visualization Course with Python, R, Tableau, and Excel
  • Introduction to R Programming
  • Data Preprocessing with NumPy
  • Introduction to Data and Data Science
  • Data Cleaning and Preprocessing with pandas
  • Introduction to Business Analytics
  • Data Analysis with Excel Pivot Tables
  • SQL
  • Credit Risk Modeling in Python
  • Python Programmer Bootcamp
  • SQL + Tableau + Python
  • Introduction to Jupyter
  • Statistics
  • Mathematics
  • Introduction to Excel
  • Probability
  • Starting a Career in Data Science: Project Portfolio, Resume, and Interview Process
  • SQL + Tableau
  • Time Series Analysis with Python
  • Power BI
  • Product Management for AI & Data Science
  • Git and GitHub
  • Deep Learning with TensorFlow 2
  • Customer Analytics in Python
  • Web Scraping and API Fundamentals in Python
  • Introduction to Python
  • Python for Finance
  • Machine Learning in Python
  • Advanced Microsoft Excel
  • Convolutional Neural Networks with TensorFlow in Python
  • Data Strategy
  • Fashion Analytics with Tableau
  • Dates and Times in Python
  • SQL for Data Science Interviews
  • Data Literacy
  • AI Applications for Business Success
  • Linear Algebra and Feature Selection
  • Machine Learning with Naïve Bayes
  • Machine Learning in Excel
  • Machine Learning with Support Vector Machines
  • A/B Testing in Python
  • Machine Learning with Decision Trees and Random Forests
  • Machine Learning with K-Nearest Neighbors
  • Machine Learning with Ridge and Lasso Regression
  • Data-Driven Business Growth
  • Corporate Strategy
  • Marketing Strategy
  • Negotiation
  • Management
  • Persuasion and Influence
  • Excel for Project Management
  • Agile and Scrum Project Management
  • Project Management
  • Blockchain for Business
  • How to Think Like a Data Scientist to Become One
  • Power Query and Data Modeling
  • Introduction to DAX
  • Building Business Reports Using Power BI
  • The Machine Learning Process A-Z
  • Working with Text Files in Python
  • Intermediate Python Programming
  • Advanced SQL
  • Select all
Filter questions by
  • Select all
  • Answered
  • Resolved
Clear all
Michaela Fisch
0
1
Is confidence interval concept applicable only for Standard Normal distribution ?
Last answered: Oct 3rd 2019
5327 views
Kasey Rice
0
1
Whats the relationship between AB test and hypothesis test?
Last answered: Oct 3rd 2019
1184 views
Kasey Rice
0
1
Categorical Variables - Relative Freq.
How do you order a large number of different categorical variables? The example in 3.6 gives three brands, but how...
Last answered: Oct 3rd 2019
1229 views
Maxim Barnes
0
2
Why age interval is taken as ordinal. Why is it not taken under Interval(Quantitative)??
Last answered: Nov 9th 2022
1802 views
Maxim Barnes
0
1
How to calculate the sample correlation?
Last answered: Oct 3rd 2019
7390 views
Aurora Faulkner
0
2
How to calculate the Correlation coefficient between the two variables?
Last answered: Nov 19th 2022
1960 views
Aurora Faulkner
0
1
What is fatter tails?
Last answered: Oct 3rd 2019
1280 views
Ciara Holder
0
1
Multicollinearity
Hi,   I have a database which tow of its variables are virtual points (that student get from doing some...
Last answered: Oct 3rd 2019
1722 views
Ciara Holder
0
1
Normality
If we assume the equality of variances in the 2 groups (females and males), does it mean that the whole data is...
Last answered: Oct 3rd 2019
1545 views
Garrett Pratt
0
2
What is hypothesis testing?
Last answered: Oct 31st 2021
1586 views
Garrett Pratt
1
1
Standard Deviation - Reason and Purpose.
I am going through the variance and standard deviation. Can you please let me know what is the reason and purpose of...
Last answered: Oct 3rd 2019
1364 views
Garrett Pratt
0
1
LL-null
Can anybody please explain LL null intuitively or more precisely?
Last answered: Oct 3rd 2019
1636 views
Salma Aguirre
0
1
LL null and Log-Likelihood relationship
Hi,   I am getting confused between Log Likelihood and LLnull.   1) Log likelihood describes how likely...
Last answered: Oct 3rd 2019
4244 views
Salma Aguirre
0
1
Usage of .params?
Hi,   What is the use of .params, instead of we write the direct formula?   Thank you!
Last answered: Oct 3rd 2019
1277 views
Alexis Haynes
0
1
Why is int() not rounding to the nearest whole number?
when we write any decimal with int why the comes with small whole number   e.g  int (4.9)         out...
Last answered: Oct 3rd 2019
1760 views

popular questions

Rafael Rodrigues de Siqueira
22
5
The ROLLBACK not working according to step-by-step class
Omar R. Valencia García
22
4
The line reg.predict(1740) does not work anymore
Toluwase Olukayode
12
4
not showing as completed even though I have complete the course. Please help me fix it
Gabriel de Jesus Patiño Pino
12
0
The answer to the third question is wrong (Practical exam 2: Discrete Distributions)
Adetunji Fasiku
11
1
The Second Question's Confusing Ability
Anower Hossain
10
1
course question
Ali Safaei
9
1
Using z statistics instead of t statistics
Davide Sanchioni
9
3
Sixth question of the practice exam
Abdulmalik Alkhamis
9
1
This is inconsistent with the quiz
Mohamed Abdelazim Mohamed Elsrougy
8
2
Resolved: Downloading Video Materials
365 Team
Instructor
8
0
How to use the Q&A HUB
Kanva Bhatia
7
2
Not getting the same results
Patarida K.
7
1
Please explain Minutes 2:42 equations
Neeladri Mohapatra
7
4
Discrepancy in minimum sample size formula and what's being used in the worked out example at 08:22
Christian MARQUAY
7
2
plt.savefig() outputs blank image