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Kazeer [188]
2 years ago
5

Please help giving brainiest

Mathematics
1 answer:
Rainbow [258]2 years ago
5 0

Answer:

180 = (d+c+h+g)

Step-by-step explanation:

We know all angles in a circle or around a point is 360°

So using that we can make the equation:

360=(e+f+d+c+h+g)

the angles e and f are on a straight line so they add up to 180°

So the other side of the line will be 180 as well. Hence we can make the equation:

180 = (d+c+h+g)

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Justin’s doctor said that the expression StartFraction x y 5 over 2 EndFraction, where x and y are his parents’ current heights
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He should have added the values in the numerator before dividing by 2.

<h2>Given </h2>

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The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the
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Answer:

a) σ  =  4933,64

b) CI 99%  = ( - 5746  ;  7194 )

c) No difference in brands

Step-by-step explanation:

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n₁   =  8

x₁   = 38222

s₁   = 4974

Brand 2:

n₂  = 8

x₂  = 37498

s₂  = 4893

As n₁  =  n₂  = 8       Small sample  we work with t -student table

degree of freedom      df  = n₁  +  n₂  - 2    df = 8 +8 -2  df = 14

CI = 99 %   CI  =  0,99

From  t-student table we find   t(c)  = 2,624

CI  =   (  x₁  -  x₂ ) ±  t(c) * √σ²/n₁   +  σ²/n₂

σ² = [( n₁  -  1 ) *s₁² +  ( n₂  -  1  ) * s₂² ] / n₁ +n₂ -2

σ² = 7* (4974)² + 7*( 4893)² / 14

σ² = 24340783       σ  =  4933,64

√ σ²/n₁  +  σ²/n₂     =  √ 24340783/8   +  24340783/8

√ σ²/n₁  +  σ²/n₂     =  2466

CI 99%  =  (  x₁  -  x₂ ) ± 2,624* 2466

CI 99%  =   724  ± 6470

CI 99%  = ( - 5746  ;  7194 )

As we can see CI 99% contains 0 and that means that there is not statistical difference between mean life of the two groups

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3 years ago
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