Effect of Standard Deviation Error on T-Value
In a matched pairs experiment, the blood pressure of 12 patients was measured before and after they took a medication. The mean of the differences (after − before) was x̄d = -8.5 mmHg, with a standard deviation of sd = 6.2 mmHg. If a researcher incorrectly used sd = 3.1 mmHg when calculating the test statistic, how would the calculated t-value be affected?
A
The t-value would be squared
B
The t-value would remain unchanged
C
The t-value would double in magnitude
D
The t-value would be halved
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