Need help with review. Please answer both questions. I really need help.
Homework Answers
7)
a)
t = (Xbar - mu)/(Sd/sqrt(n))
= (28 - 30)/(8/sqrt(32))
= -1.41421
= -1.41
df =n-1 = 31
at alpha = 0.01
P(T < t-critical) = 0.01
t-critical = -2.453
option A) the critical value -t_alpha =
-2.453
we fail to reject the null hypothesis
since -1.41 > -2.453
The data does not provide sufficient evidemce
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Need help with review. Please answer both questions. I really
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