In testing the hypothesis Ho: μ=50 vs Ha: μ≠50, the following was obtained: n=64,x ̅=53.5 and σ=10. The test statistic value is       A. t=2.8       B. t=-2.8       C. z=2.8       D. z=-2.8

MATLAB: An Introduction with Applications
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 In testing the hypothesis Ho: μ=50 vs Ha: μ≠50, the following was obtained: n=64,x ̅=53.5 and σ=10. The test statistic value is
 
 
 
A. t=2.8
 
 
 
B. t=-2.8
 
 
 
C. z=2.8
 
 
 
D. z=-2.8
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