A factory compares the treatment effects of two processes (Process A and Process B) on the elasticity of rubber products through 10 paired experiments. In each paired experiment, two rubber products of the same material are selected, one is randomly chosen to be treated with Process A and the other with Process B. The elasticity rates of the rubber products treated by Process A and Process B are recorded as $x _ { i } , y _ { i } ( i = 1,2 , \cdots 10 )$ respectively. The experimental results are as follows:

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\begin{tabular}{ | c | c | c | c | c | c | c | c | c | c | c | }
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Experiment Number $i$ & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \\
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Elasticity Rate $x _ { i }$ & 545 & 533 & 551 & 522 & 575 & 544 & 541 & 568 & 596 & 548 \\
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Elasticity Rate $y _ { i }$ & 536 & 527 & 543 & 530 & 560 & 533 & 522 & 550 & 576 & 536 \\
\hline
\end{tabular}
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Let $z _ { i } = x _ { i } - y _ { i } ( i = 1,2 , \cdots , 10 )$. Let $\bar { z }$ denote the sample mean of $z _ { 1 } , z _ { 2 } , \cdots , z _ { 10 }$ and $s ^ { 2 }$ denote the sample variance.\\
(1) Find $\bar { z }$ and $s ^ { 2 }$.\\
(2) Determine whether the elasticity rate of rubber products treated by Process A is significantly higher than that treated by Process B. (If $\bar { z } \geqslant 2 \sqrt { \frac { s ^ { 2 } } { 10 } }$, then it is considered that the elasticity rate of rubber products treated by Process A is significantly higher than that treated by Process B; otherwise, it is not considered to be significantly higher.)