Basic Python & Machine Learning

Strings is a data structure in python. There are two types of data structures- immutable and mutable. Strings are under which category?

• Always Immutable

• Mutable

Which of the following is a Python tuple?

• (1,2,3)

• [1,2,3]

• {1,2,3}

• All of the above

What does the following line of code do to a string S, S.strip()

• Remove spaces in the left side of the sting

• Remove spaces in the right side of the sting

• Remove empty spaces from both ends of the string

Which of the functions map, reduce, filter work on Strings?

• Map

• Reduce

• Filter

• All of these

The value of the correlation coefficient will always be:

• infinity to 0

• 0 to infinity

• Between -1 and 1

• Between 0 and 1

The strength of a linear regression line is determined by the value of the R-squared. If this value is found to be 0, what does it imply?

• variance can be explained

• No variance in the data is being explained by the fitted line.

Suppose that you run a linear regression on the data, where you have X as the independent variable and y as the target variable. You find that the correlation between y and X is -0.97. What can you say in this situation?

• X and Y are weakly correlated

• X and Y are not at all related

• X and y are strongly related

Suppose you have 'n' categorical variables, each with 'm' levels. How many dummy variables would you need to represent all the levels of all the categorical variables?

• m*n

• (m-1)*n

• m*(n-1)

Which of the following is/are an example of an automated approach for linear regression?

• Recursive feature elimination

• Stepwise selection using AIC

• Regularisation

• All of the above

VIF is a measure of ___.

• Inflation factor

• How well a predictor variable is correlated with all the other variables, excluding the target variable

• How the predictor variable is correlated with target variable