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Irina-Kira [14]
3 years ago
14

Y − x = 12 y + x = -26

Mathematics
1 answer:
photoshop1234 [79]3 years ago
4 0
Y = -7
x = -19

Steps:

Add the two equations together:
y - x + y + x = -14
2y = -14
y = -7

-7 + x = -26
x = -19
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A random sample of 70 printers discovered that 25 of them were being used in small businesses. find the 95% limit for the popula
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Answer:

The sample proportion of printers used in small business is:

\hat{p}=\frac{25}{70}=0.3571

The 95% confidence interval for the population proportion of printers that are used in small businesses is:

\hat{p} \pm z_{\frac{0.05}{2}} \sqrt{\frac{\hat{p}(1-\hat{p})}{n} }

Where:

z_{\frac{0.05}{2}}=1.96 is the critical value at 0.05 significance level

\therefore 0.3571 \pm 1.96 \sqrt{\frac{0.3571(1-0.3571)}{70} }

         0.3571 \pm 0.1122

         \left ( 0.3571 - 0.1122, 0.3571 + 0.1122 \right)

         \left(0.245,0.469 \right)

Therefore, the 95% confidence interval for the population proportion of printers that are used in small businesses is (0.245 , 0.469)



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