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frosja888 [35]
3 years ago
6

Based on sample results, a 90% confidence interval for the mean servings of fruit per day consumed by grade school children is (

0.21, 2.45). What is the margin of error?
Mathematics
1 answer:
Artemon [7]3 years ago
5 0

Answer: 1.12

Step-by-step explanation:

The confidence interval for the mean \mu and margin of error E is given by :-

(\mu-E,\ \mu+E)                                             --------------(1)

The given confidence interval : (0.21, 2.45)              -------------(2)

From (1) and (2), we  have

\mu-E=0.21-------(3)\\\\\mu+E=2.45--------(4)

Subtract equation (3) from (4), we get

2E=2.45-0.21\\\\\Rightarrow\ 2E=2.24\\\\\Rightarrow\ E=\dfrac{2.24}{2}=1.12

Hence, the margin of error is 1.12 .

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Step-by-step explanation:

Simplify   1/k

    3     2         1

 (((—+2)-(—•k))-4)-(—-2)  = 0

    k     k         k

2.1   Subtracting a whole from a fraction

      2     2 • k

   2 =  —  =  —————

        1       k  

2.2       Adding up the two equivalent fractions

Add the two equivalent fractions which now have a common denominator

1 - (2 • k)     1 - 2k

———————————  =  ——————

     k            k  

Simplify  2/k

 3     2        (1-2k)

 (((—+2)-(—•k))-4)-——————  = 0

    k     k          k  

Simplify 3/k

  3     2        (1-2k)

 (((—+2)-(—•k))-4)-——————  = 0

    k     k          k  

5.1   Adding a whole to a fraction

 3                      (1 - 2k)

 (((— +  2) -  2) -  4) -  ————————  = 0

    k                         k    

6.1   Subtracting a whole from a fraction

        2     2 • k

   2 =  —  =  —————

        1       k  

7.1   Subtracting a whole from a fraction

3 + 2 • k     2k + 3

—————————  =  ——————

    k           k  

8.1       Adding fractions which have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

        2     2 • k

   2 =  —  =  —————

        1       k  

9.1     Pull out like factors :

  2 - 2k  =   -2 • (k - 1)

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Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.

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Here's how:

 -2•(k-1)

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    k    

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The equation now takes the shape :

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This equation has no solution.

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10.3      Solve  :    k-1 = 0

Add  1  to both sides of the equation :

                     k = 1

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