Wilcoxon signed-rank test in SciPy - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Wilcoxon test function from scipy.

SciPy

from scipy.stats import [1]

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

Awilcoxon

Bttest_rel

Cmannwhitneyu

Dpearsonr

Attempts:

3 left

💡 Hint

Common Mistakes

Importing the wrong test function like ttest_rel or mannwhitneyu.

Trying to import from the wrong module.

The Wilcoxon signed-rank test function is called wilcoxon and is imported from scipy.stats.

2fill in blank

medium

Complete the code to perform the Wilcoxon signed-rank test on two related samples, sample1 and sample2.

SciPy

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

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

Asample1

Bdata1

Cx

Dvalues1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that is not defined or unrelated.

Swapping the order of samples incorrectly.

The first sample to compare is sample1, which pairs with sample2 in the Wilcoxon test.

3fill in blank

hard

Fix the error in the code to correctly perform the Wilcoxon test on two samples named before and after.

SciPy

result = wilcoxon(before, [1])

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Abefor

Bafter

Cafter_data

Dbefore

Attempts:

3 left

💡 Hint

Common Mistakes

Misspelling variable names like 'befor'.

Using the wrong variable for the second sample.

The second sample is named after. Using the correct variable name avoids errors.

4fill in blank

hard

Fill both blanks to create a dictionary with test statistic and p-value from the Wilcoxon test result.

SciPy

result_dict = {'statistic': result.[1], 'p_value': result.[2]

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Astatistic

Bpvalue

Cp_value

Dstat

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect attribute names like 'p_value' or 'stat'.

Confusing the attribute names with variable names.

The Wilcoxon test result object has attributes statistic and pvalue to access the test statistic and p-value.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that stores the Wilcoxon test results for multiple paired samples in data_dict.

SciPy

results = [1]: wilcoxon(data_dict[[2]][0], data_dict[[3]][1]) for [1] in data_dict}

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

Akey

B'sample1'

C'sample2'

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Using string literals instead of variables to access dictionary keys.

The dictionary comprehension iterates over keys in data_dict using key. The same key is used to access paired samples for the Wilcoxon test.