Answers
H0: 
<= 2.8
Ha: > 2.8
The test is right tailed. .
Test statistics
t = 
- / S / sqrt(n)
2.82 - 2.8 / 0.03 / sqrt(65)
= 5.37
The p-value for 0.025 level with 64 df = 0
Since p-value < 0.025 level.
Reject the null hypothesis
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