a)
Ho : µd= 0
Ha : µd > 0
b)
Level of Significance , α =
0.05
sample size , n = 15
mean of difference , D̅ =
1.1500
std dev of difference , Sd =
1.6400
std error , SE = Sd / √n = 1.6400 /
√ 15 = 0.4234
t-statistic = (D̅ - µd)/SE = ( 1.15
- 0 ) / 0.4234
= 2.72
Degree of freedom, DF= n - 1 =
14
t-critical value , t* =
1.76 [excel function: =t.inv(α,df) ]
c)
Please let me know in case of any doubt.
Thanks in advance!
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