APFIVE Effect of Standard Deviation Error on T-Value
In a matched pairs experiment measuring blood pressure before and after medication, the differences (after - before) for 12 patients had x̄d = -8.5 mmHg and sd = 6.2 mmHg. If the researcher made a computational error and used sd = 3.1 in the test statistic, how would this affect the calculated t-value?
A
The t-value would double in magnitude
B
The t-value would remain unchanged
C
The t-value would be halved
D
The t-value would be squared
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