[Solved] You have two groups of exam scores: group A = [55, 60, 65, 70], group B = [50, 58, 62, 68].... Which code snippet correctly performs this test? | SciPy

SciPy - Statistical Tests

You have two groups of exam scores: group A = [55, 60, 65, 70], group B = [50, 58, 62, 68]. You want to test if group A scores are generally higher than group B using Mann-Whitney U test. Which code snippet correctly performs this test?

Amannwhitneyu(groupA, groupB, alternative='greater')

Bmannwhitneyu(groupB, groupA, alternative='greater')

Cmannwhitneyu(groupA, groupB, alternative='less')

Dmannwhitneyu(groupB, groupA, alternative='less')

Step-by-Step Solution

Solution:

Step 1: Define hypothesis
We want to test if group A scores are higher than group B.
Step 2: Choose alternative parameter
Use alternative='greater' to test if first sample tends to be greater than second.
Step 3: Pass samples in correct order
First argument should be groupA, second groupB.
Final Answer:
mannwhitneyu(groupA, groupB, alternative='greater') -> Option A
Quick Check:
Test if A > B = B [OK]

Quick Trick: Use alternative='greater' with first sample as group to test higher values [OK]

Common Mistakes:

MISTAKES

Swapping sample order
Using wrong alternative parameter
Confusing greater with less

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Which code snippet correctly performs this test?

Step 1: Define hypothesis

Step 2: Choose alternative parameter

Step 3: Pass samples in correct order

Final Answer:

Quick Check:

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