Descriptive statistics in Python with the statistics module

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Quick Questions

Shade in the A or B circle for each question.

1. Which line must come first before you can use statistics.mean() in Python?

A import statistics

B include statistics

2. Which call finds the average of the list marks = [60, 70, 80]?

A statistics.middle(marks)

B statistics.mean(marks)

3. For data = [2, 4, 9, 11, 20], which function returns 9?

A statistics.median(data)

B statistics.mean(data)

4. Which function measures the spread of the values in a list?

A statistics.stdev(data)

B statistics.median(data)

5. Which code finds the range of the list data?

A max(data) + min(data)

B max(data) - min(data)

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1statistics.median(marks)		Astatistics.stdev(marks)
2max(marks) - min(marks)		Bimport statistics print(statistics.mean(marks))
3Make the statistics functions available before calculating the average of a list		Cmean() is called without the statistics prefix, so Python raises a NameError. Write statistics.mean(marks) after import statistics.
4Measure the spread of a sample of data using standard deviation		DThe subtraction is the wrong way round, which gives a negative range. It should be max(marks) - min(marks).
5print(mean(marks))		EReturns the middle value of the list marks once it is sorted
6range = min(marks) - max(marks)		FCalculates the range, the gap between the highest and lowest values

Definitions

statistics.mean(data)

Fill in the Blanks

Complete each line of code by filling in the missing parts.

______ statistics marks = [72, 85, 90, 64] print(statistics.mean(marks))

import statistics marks = [72, 85, 90, 64] print(statistics.____(marks))

import statistics ages = [15, 17, 16, 18, 16] print(statistics.______(ages))

import statistics scores = [4, 8, 6, 5, 7] print(statistics._____(scores))

data = [12, 18, 9, 25, 14] spread = max(data) - ___(data) print(spread)

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A import statistics

B data = [4, 8, 6, 5, 7

C avg = statistics.mean(data)

D print(avg)

Question 2

A import statistics

B marks = [70, 85, 90, 65]

C mid = statistics.median(marks)

D print("Median:" mid)

Question 3

A import statistics

B marks = [52, 61, 75, 80, 68]

C sd = statistics.stdev(marks)

D print(round(s, 2))

Question 4

A import statistics

B data = [3, 9, 4, 7, 12]

C total = sum[data]

D print(total / len(data))

Question 5

A data = [14, 22, 9, 31, 18]

B biggest = max(data)

C smallest = max(data)

D print(biggest - smallest)

Answer Key

Descriptive statistics in Python with the statistics module

Section A: Quick Questions

A — import statistics

B — statistics.mean(marks)

A — statistics.median(data)

A — statistics.stdev(data)

B — max(data) - min(data)

Section B: Match the Pairs

statistics.median(marks) → Returns the middle value of the list marks once it is sorted

max(marks) - min(marks) → Calculates the range, the gap between the highest and lowest values

Make the statistics functions available before calculating the average of a list → import statistics print(statistics.mean(marks))

Measure the spread of a sample of data using standard deviation → statistics.stdev(marks)

print(mean(marks)) → mean() is called without the statistics prefix, so Python raises a NameError. Write statistics.mean(marks) after import statistics.

range = min(marks) - max(marks) → The subtraction is the wrong way round, which gives a negative range. It should be max(marks) - min(marks).

Section C: Definitions

statistics.mean(data) — The statistics module calculates descriptive statistics on a list: mean() is the average, median() the middle value, stdev() the spread. Use import statistics first.

Section D: Fill in the Blanks

import statistics
marks = [72, 85, 90, 64]
print(statistics.mean(marks))

import statistics
marks = [72, 85, 90, 64]
print(statistics.mean(marks))

import statistics
ages = [15, 17, 16, 18, 16]
print(statistics.median(ages))

import statistics
scores = [4, 8, 6, 5, 7]
print(statistics.stdev(scores))

data = [12, 18, 9, 25, 14]
spread = max(data) - min(data)
print(spread)

Section E: Spot the Error

B — The list is missing its closing square bracket. It should be data = [4, 8, 6, 5, 7].

D — print() needs a comma between its arguments. It should be print("Median:", mid).

D — The variable is called sd, not s, so Python would raise a NameError. It should be print(round(sd, 2)).

C — Functions are called with round brackets, not square brackets. It should be total = sum(data).

C — The smallest value needs min(), not max(). With max() the range would always be 0. It should be smallest = min(data).