Answer:
[tex]t^2=9.2[/tex]
Step-by-step explanation:
From the question we are told that
Standard Deviation [tex]\sigma=28.8[/tex]
Sample space [tex]n=12[/tex]
[tex]s^2= 21.6[/tex]
Generally the equation for test statistics is mathematically given by
[tex]t^2=frac{(n-1)*s^2}{\sigma^2}}[/tex]
[tex]t^2=\frac{(12-1)*21.6}{25.8}[/tex]
Therefore the standardized test statistics
[tex]t^2=9.2[/tex]
