Answer :
test statistics=(x1 bar- x2 bar)(s1^2/n1)(s2^2/n2)
substitute the values and you will get the answer.
I got this answer. please check it.
(x1 bar- x2 bar)(s1^2/n1)(s2^2/n2)
⇒(648-495)(120/100)(140/90)
⇒(153)(12/10)(14/9)
⇒1428/5
⇒285.6
Therefore,Statistics = 285.6
substitute the values and you will get the answer.
I got this answer. please check it.
(x1 bar- x2 bar)(s1^2/n1)(s2^2/n2)
⇒(648-495)(120/100)(140/90)
⇒(153)(12/10)(14/9)
⇒1428/5
⇒285.6
Therefore,Statistics = 285.6