What is wrong with this code snippet that attempts to perform a paired t-test?

medium📝 Debug Q6 of 15

SciPy - Statistical Tests

from scipy.stats import ttest_rel
control = [10, 12, 14]
treatment = [11, 13]
result = ttest_rel(control, treatment)
print(result.pvalue)

AThe print statement should print result.statistic instead of result.pvalue.

BThe function ttest_rel is used incorrectly; it should be ttest_ind for paired data.

CThe two input arrays have different lengths, which is invalid for a paired t-test.

DThe arrays should be converted to numpy arrays before passing to ttest_rel.

Step-by-Step Solution

Solution:

Step 1: Check input arrays length
Paired t-test requires both samples to have the same length because it compares paired observations.
Step 2: Identify the error
Here, 'control' has 3 elements, 'treatment' has 2 elements, so ttest_rel will raise an error.
Final Answer:
The arrays have different lengths, invalid for paired t-test. -> Option C
Quick Check:
Paired tests need equal-length arrays. [OK]

Quick Trick: Paired t-test needs equal-length samples. [OK]

Common Mistakes:

MISTAKES

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