Uh, i believe 
PLEASE ANSWER THIS IS THE THIRD TIME IVE POSTED THIS
1 answer:
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Answer:
3.06
Step-by-step explanation:
The correct answer is - 3.06
Reason -
For sample A :
mean, = 8.05
Standard deviation, = 1.36
Size, = 50
For sample B :
mean, = 7.26
Standard deviation, = 1.06
Size, = 38
Now,
-
= 8.05 - 7.26 = 0.79
Standard deviation error, SE = √(²/
+
²/
) = 0.2580
Now,
Z-statistic = ( -
)/ SE
= 0.79/0.2580
= 3.06
⇒Z-statistic = 3.06