Data Analytics UNIT Module 1-2 Mid Test

What is the output of the following code: for i in range(5): print(i)?

• 10

• 0 1 2 3 4

• -1

• 5

How do you write an if statement in Python?

• if (condition) do_something()

• if: condition do_something()

• if condition do_something()

• if condition: do_something()

An e-commerce site claims that 95% of its orders are delivered on time. If you order 3 items on different dates, what is the probability that all 3 are delivered on time?

• 0.95

• 0.90

• About 0.857

• 0.99

How can you read a file in Python?

• Use 'with open(filename, 'r') as file: content = file.read()' to read a file in Python.

• Use 'with open(filename, 'w') as file: content = file.read()' to read a file in Python.

• Read a file by calling 'file.read(filename)' directly.

• Use 'open(filename) as file: content = file.read()' to read a file in Python.

What function is used to write data to a file in Python?

• append()

• export()

• write()

• save()

Define the term 'probability' in your own words.

• Probability is the certainty of an event occurring.

• Probability is the total number of possible outcomes.

• Probability is the average of all possible events.

• Probability is the likelihood of an event happening.

What is the formula for calculating permutations?

• P(n, r) = n! + (n - r)!

• P(n, r) = n! * r!

• P(n, r) = n! / (n - r)!

• C(n, r) = n! / r!

How do you calculate combinations in Python?

• Use 'from itertools import permutations'

• Use 'from math import factorial'

• Use 'from itertools import product'

• Use 'from itertools import combinations' or 'from math import comb'.

What is the probability mass function (PMF)?

• A method for estimating the mean of a dataset.

• A graphical representation of probability distributions.

• A function that assigns probabilities to discrete outcomes.

• A function that calculates averages for continuous data.

Explain the difference between PDF and PMF.

• PDF is used for categorical data; PMF is for numerical data.

• PDF is for discrete variables; PMF is for continuous variables.

• PDF and PMF are the same concept.

• PDF is for continuous variables; PMF is for discrete variables.