For H0 and H1 with 0.05 alpha,
H0: Variance of weights made by machine1 = Variance of weights made by machine 2
H1:Variance of weights made by machine1 > Variance of weights made by machine 2
We have the following outputs.
Sample size of data from machine 1 = 30
Sample size of data from machine 2 = 20
F statistics = 3.45
Which one is the correct one?
a. 
Since F stat (3.45) is not larger than upper critical value (4.357), do not reject H0. Thus there is no evidence that Variance of weights made by machine1 > Variance of weights made by machine 2. 

b. 
Since F stat (3.45) is larger than upper critical value (2.077), reject H0. Thus there is no evidence that Variance of weights made by machine1 > Variance of weights made by machine 2. 

c. 
Since F stat (3.45) is not larger than upper critical value (4.357), do not reject H0. Thus there is evidence that Variance of weights made by machine1 > Variance of weights made by machine 2. 

d. 
Since F stat (3.45) is larger than upper critical value (2.077), reject H0. Thus there is evidence that Variance of weights made by machine1 > Variance of weights made by machine 2. 
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