Answer:
Given:
n = 15
c = 95% = 0.95
Let us assume:
α = 0.05
Determine the difference in value of each pair.
→See attached for the table←
→See attached for the for the workings←
Result
a) There is sufficient evidence to reject the claim that the two methods provide the same mean value for natural vibration frequency.
b) (-10.9646, -0.0068)
I have no clue what this answer is but I hope you find it out
Answer:y+2.9=11, 2y+1=17.2, 28.4-y=20.3
Step-by-step explanation:

To remove √3 from denominator, we multiply both numerator as well as denominator with √3
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It's 5. Just took this test and got this question right :)