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2 years ago

Help!!!!! No weird answers pls

Mathematics

2 answers:

Papessa [141]2 years ago

7 0

open the parenthes. and then after that you'll get 27+12x-15. if you simplify that then you'll get 12x+12

g100num [7]2 years ago

5 0

3*9= 27
3*4x=12x. 27+12x-15
3*-5=-15

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Answer:

The 99% confidence interval is $71.67 < \mu < 78.33$

Step-by-step explanation:

From the question we are told that

The sample size is $n = 15$

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The standard deviation is $s = 5$

Given that confidence is 99% then the level of significance is mathematically represented as

$\alpha = 100 - 99$

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$\alpha = 0.01$

Next we obtain the critical values of $\frac{ \alpha }{2}$ from the normal distribution table

The value is

$Z_{\frac{ \alpha }{2} } = 2.58$

Generally the margin for error is mathematically represented as

$E = Z_{\frac{ \alpha }{2} } * \frac{ s}{ \sqrt{n} }$

=> $E = 2.58 * \frac{ 5}{ \sqrt{15} }$

=> $E = 3.3307$

The 99% confidence interval is mathematically represented as

$\= x -E < \mu < \= x +E$

=> $75 - 3.3307 < \mu$

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Step-by-step explanation:

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Steps to solve:

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