Mann-Whitney U test in SciPy - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Mann-Whitney U test function from scipy.stats.

SciPy

from scipy.stats import [1]

Drag options to blanks, or click blank then click option'

Amann_whitney_u

Bmannu

Cmann_whitney

Dmannwhitneyu

Attempts:

3 left

💡 Hint

Common Mistakes

Using underscores in the function name like 'mann_whitney_u'.

Capitalizing parts of the function name.

The correct function name is mannwhitneyu in scipy.stats.

2fill in blank

medium

Complete the code to perform the Mann-Whitney U test on two samples, sample1 and sample2.

SciPy

stat, p = mannwhitneyu([1], sample2)

Drag options to blanks, or click blank then click option'

Asample1

Bsample3

Cdata1

Dvalues1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name not defined in the context.

Swapping the order of samples incorrectly.

The first sample to test must be sample1 as given in the instruction.

3fill in blank

hard

Fix the error in the code to correctly perform a two-sided Mann-Whitney U test.

SciPy

stat, p = mannwhitneyu(sample1, sample2, alternative=[1])

Drag options to blanks, or click blank then click option'

A'greater'

B'two_sided'

C'two-sided'

D'two_sided_test'

Attempts:

3 left

💡 Hint

Common Mistakes

Using underscores instead of hyphens in 'two-sided'.

Using invalid strings like 'two_sided_test'.

The correct string for a two-sided test in mannwhitneyu is 'two-sided'.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps each word to its length if the length is greater than 3.

SciPy

{word: [1] for word in words if [2]

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Alen(word)

Bword

Clen(word) > 3

Dword > 3

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself as the value instead of its length.

Comparing the word string directly to a number.

The dictionary maps words to their lengths, so the value is len(word). The condition filters words with length greater than 3, so len(word) > 3 is correct.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps each uppercase word to its length if the length is greater than 4.

SciPy

{ [1]: [2] for word in words if [3] }

Drag options to blanks, or click blank then click option'

Aword.upper()

Blen(word)

Clen(word) > 4

Dword.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using word.lower() instead of uppercase for keys.

Using the word itself as the value instead of its length.

Incorrect condition like word > 4.

The key is the uppercase version of the word (word.upper()), the value is the length (len(word)), and the condition filters words longer than 4 characters (len(word) > 4).