Free Practice Quiz Question List

2 Programming Foundations for Data Analysis Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Programming Foundations for Data Analysis, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

In Python, are count and Count two different variable names?

A
True
B
False

Written response

1 point

Which Python keyword begins a function definition?

Fill in the blank

1 point

A loop repeats as long as its condition remains true.

Choose one

1 point

What value is assigned to status when this code runs?

reading = 100

if reading < 0:
    status = "check: negative reading"
elif reading > 100:
    status = "check: unusually high reading"
else:
    status = "within expected range"

A
check: negative reading
B
within expected range
C
check: unusually high reading

True or false

1 point

A data-analysis program should automatically treat every unusual reading as erroneous, without considering context.

A
True
B
False

Written response

1 point

A list contains the readings [4, -2, 8]. A program retains readings greater than or equal to zero and calculates the mean of the retained values. What is that mean?

Choose one

1 point

Given the code below, what value does first_reading contain after the assignment?

readings = [12.4, 15.0, 13.6]
first_reading = readings[0]
readings.append(14.2)

A
15.0
B
13.6
C
12.4
D
14.2

Choose one

1 point

What does this expression return if the dictionary has no region key?

station = {"name": "North"}
station.get("region", "unknown")

A
It raises a KeyError because the key is absent.
B
It returns unknown.
C
It adds the key region with the value unknown to the dictionary.

Choose all

1 point

Select all statements that accurately describe Python collections.

A
A list is an ordered, changeable sequence.
B
A tuple is an ordered, unchangeable sequence.
C
A dictionary associates keys with values.
D
A set holds distinct values.
E
A set is an ordered sequence that permits repeated values.

Choose all

1 point

Select all statements that correctly describe Python loops or safe practices when processing collections.

A
A for loop can process items in a collection in turn.
B
range() can generate a sequence of integers.
C
A while loop repeats as long as its condition remains true.
D
A loop variable can take the next item in the collection on each pass.
E
It is generally clearer and safer to change a collection while iterating over that same collection.

Fill in the blank

1 point

In this function, what value is returned when values is an empty list?

def mean(values):
    if len(values) == 0:
        return 

    return sum(values) / len(values)

Open ended

1 point

Suppose an analysis processes readings that may be negative. Explain how a loop, a conditional, a separate list, and a mean-calculating function can work together to produce the mean of nonnegative readings. Why should excluded readings be preserved or recorded?

Choose one

1 point

What is the type of the value returned by float("12.4")?

A
str
B
float
C
int
D
bool

True or false

1 point

A program finds a reading above 100. Based on the guidance for interpreting unusual values, should it automatically conclude that the reading is wrong?

A
True
B
False

Choose one

1 point

The dictionary station has no "region" key. What does station.get("region", "unknown") return?

A
station["region"] returns "unknown" if the key is missing.
B
station.get("region", "unknown") returns "unknown" if the key is missing.
C
station.get("region", "unknown") adds the key with value "unknown" to the dictionary.
D
station.get("region", "unknown") raises a KeyError if the key is missing.

Choose one

1 point

In Python, what index accesses the third item in a list?

Choose one

1 point

You need to store distinct values and do not need duplicates. Which Python collection best fits this purpose?

A
A list
B
A tuple
C
A set
D
A dictionary

Choose one

1 point

Given the Python statements below, what is the value of total after both statements run?

total = 3
total = total + 1

A
It checks whether total and total + 1 are equal.
B
It updates total from 3 to 4.
C
It raises a NameError because total has not been defined.
D
It changes total to the text value "4".

Written response

1 point

Using the mean function below, what numerical value is returned by mean([2, 4, 6])?

def mean(values):
    if len(values) == 0:
        return None
    return sum(values) / len(values)

Written response

1 point

Given is_ready = False and status = "False", what is the Python type of the value assigned to is_ready?