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omeli [17]
3 years ago
11

What is the value of x if x+15=38 ?

Mathematics
2 answers:
IrinaVladis [17]3 years ago
7 0

Answer:

23

Step-by-step explanation:

Subtract 15 by both sides to get X by itself and you get your answer!

Doss [256]3 years ago
5 0

Answer:

x=23

Step-by-step explanation:

x+15=38 (we subtract 15 from both sides to get x alone on one side)

x=23

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Answer:

a) [24.114,29.2858]

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Step-by-step explanation:

a)

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

\bf \bar x= 26.7 is the sample mean  

s = 17.7 is the sample standard deviation  

n = 180 is the sample size

Since the sample size is big enough, we can use the Normal N(0,1) to compute \bf z^* and it would be 1.96(*) (a value such that the area under the Normal curve outside the interval [-z, z] is 5% (0.05))

and our 95% confidence interval is

\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>

b)

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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Answer:

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Step-by-step explanation:

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