It is claimed that the mean salary level in Firm A is different from Firm B. A random sample of 81 employees from Firm A and a random sample of 144 employees from Firm B are selected and their mean and variances are found as follows. 

Fill in the blank cell using the value of ‘100×4+3000’.

	Firm A	Firm B
Mean	$	$ 3,415
Variance	25,500	18,650

1. 
   
2.  Required
3. Test if the claim is true at α=1% level.
4. Calculate p-value.
5. Is there any evidence that at α=10% level?

Answer rating: 100% (QA)

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