DSE Basic 4

Question 1

Which of the following best describes a 'data pipeline'?

Accepted Answer

A series of automated steps to move and transform data

Answer

A data pipeline automates the flow of data through ingestion, transformation, and loading steps.

Question 2

What does the term 'null hypothesis' mean in statistical testing?

Accepted Answer

The assumption that there is no effect or difference

Answer

The null hypothesis assumes no effect or difference exists; statistical tests try to find evidence against it.

Question 3

Which metric measures the proportion of actual positives correctly identified by a classifier?

Accepted Answer

Recall

Answer

Recall (sensitivity) is TP / (TP + FN), measuring how well the model finds all true positives.

Question 4

What is the purpose of a train/test split in machine learning?

Accepted Answer

To evaluate model performance on unseen data

Answer

Splitting data ensures the model is evaluated on data it has never seen, giving an honest performance estimate.

Question 5

A correlation coefficient of -0.9 indicates:

Accepted Answer

Strong negative relationship

Answer

A correlation of -0.9 is close to -1, indicating a strong negative linear relationship between two variables.

DSE - Data Science Practice Test