Week 9-10 Quiz Statistical Analysis

What is descriptive statistics primarily used for?

• a) Predicting future outcomes
  

• b) Summarizing and describing dataset features
  

• c) Testing machine learning models
  

• d) Cleaning data

Which of the following is a measure of central tendency?

• a) Mean
  

• b) Standard deviation
  

• c) Variance
  

• d) Correlation

What does the mean() function in Python calculate?

• a) The middle value in a dataset
  

• b) The average of values in a dataset
  

• c) The highest value in a dataset
  

• d) The sum of all values in a dataset

Which Python library provides functions for statistical analysis like correlation and covariance?

• a) pandas
  

• b) NumPy
  

• c) Seaborn
  

• d) Matplotlib

What does a positive correlation indicate?

• a) As one variable increases, the other decreases
  

• b) As one variable decreases, the other increases
  

• c) Both variables move in the same direction
  

• d) There is no relationship between the variables

What does the Pearson correlation coefficient measure?

• a) The mean of two datasets
  

• b) The linear relationship between two variables
  

• c) The difference between two datasets
  

• d) The probability of two events occurring

Which function in pandas calculates the correlation between columns?

• a) correlation()
  

• b) corr()
  

• c) cov()
  

• d) pearson()

What does a correlation value of -1 indicate?

• a) No relationship between variables
  

• b) A strong positive relationship
  

• c) A strong negative relationship
  

• d) A weak relationship

9. What is the purpose of covariance in data analysis?

• a) To identify the mean of a dataset
  

• b) To measure how two variables change together
  

• c) To calculate the spread of data
  

• d) To test hypotheses

Which of the following is a hypothesis test used to compare the means of two groups?

• a) Correlation test
  

• b) t-test
  

• c) Chi-square test
  

• d) Regression test