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2 years ago

-8.5x +0.43 = -2.97 The solution is x =

Mathematics

1 answer:

sergey [27]2 years ago

6 0

Answer:

x=0.4

Step-by-step explanation:

ubtract

0.43

from both sides of the equation.

−

8.5

−

2.97

−

0.43

Subtract

0.43

from

−

2.97

−

8.5

−

3.4

Divide each term in

−

8.5

−

3.4

−

8.5

−

8.5

−

8.5

−

3.4

−

8.5

Divide

−

3.4

−

8.5

0.4

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lord [1]

Answer:

a) [24.114,29.2858]

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Step-by-step explanation:

The 95% confidence interval is given by the interval

$\bf [ \bar x-z^*\frac{s}{\sqrt n}, \bar x+t^*\frac{s}{\sqrt n}]$

where

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s = 17.7 is the sample standard deviation

n = 180 is the sample size

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$\bf [26.7-1.96*\frac{17.7}{\sqrt{180}}, 26.7+1.96*\frac{17.7}{\sqrt{180}}]=\boxed{[24.114,29.2858]}$

(*)

This value can be computed in Excel with

<em>NORMINV(1-0.025,0,1)</em>

and in OpenOffice Calc with

<em>NORMINV(1-0.025;0;1)</em>

Since 30 is not in the 95% confidence interval, there is a 95% probability that 30 is not the true mean WEP

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