Data Science for Beginners 2

A spreadsheet in pandas is called a dataframe, then a column is call _____?

• list

• dictionary

• series

• array

Which pandas function is used to import csv file into Python?

• read_excel()

• read_csv()

• load_csv()

• read_json()

Given a dataframe containing columns 'age', 'gender', 'occupation', 'salary', and 'BMI', how to group the rows of data according to 'gender'?

• use groupby() function

• use iloc() function

• use pivot_table() function

• use info() function

the most frequently occurring value(s) in a set of data

• mode

• mean

• median

• range

Which of the following is(are) nominal categorical data?

(Hint: you can select more than one answer)

• favourite colour

• subjects taken in a semester

• age groups

• country of residence

Which of the following is(are) used to describe the spread of a dataset?

(Hint: you can choose multiple answer)

• mean

• skewness

• inter-quartile range

• homogeneity

Which graph is best to visualise the spread of a continuous dataset?

• histogram

• scatter plot

• pie chart

• contour plot

A data scientist is trying to predict if a customer will purchase a product based on the historical purchase of the customer, the balance of account, and the seller's reviews. The problem that the data scientist has is a _______ problem.

• object detection

• regression

• clustering

• classification

Which of the following is a classification algorithm?

(Hint: you can select more than one answer)

• k-nearest neighbour

• logistic regression

• decision tree

• k-means

Which of the following Python library is not for training machine learning models?

• scikit-learn

• ChatGPT

• tensorflow

• pytorch