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frozen [14]
3 years ago
6

One hundred sixty-five of the 225 high school students surveyed at a local school say they went outside more during school hours

as elementary school students than they do now as high school students. Calculate the margin of error (ME), rounded to the nearest tenth of a percent. Is it reasonable that the state education department claims the percentage for the entire state is 78%? Justify your answer.
Mathematics
1 answer:
timama [110]3 years ago
7 0
It is reasonable because the ME is 5.9% and the population proportion of 78% falls in the  sample interval of 73.3% ± 5.9%  

or 

Yes, it is reasonable because the ME is 5.9% and the population proportion of 73% falls within the sample interval of 78.0% ± 5.9% 

either one will work 
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Step-by-step explanation:

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(7,5)(-4,-1)
slope = (-1-5) / (-4-7) = -6/-11 = 6/11

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6 0
3 years ago
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Solve for m. am+ bm= c-2
g100num [7]

Answer:

m = (c-2)/(a+b)

Step-by-step explanation:

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m( a+b) = c-2

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Vera_Pavlovna [14]
<h2><u>Direct answer</u> :</h2><h2>\color{plum}\boxed{\tt Statements : }</h2>
  1. Segment AB = Segment AD
  2. Segment BC = Segment DC
  3. Angle B and Angle D are equal.
  4. Segment AC bisects angle BAD
  5. Segment AC = Segment AC
  6. ∠ACD = ∠ACB
  7. △ABC≅△ADC under ASA congruence criterion.
  8. △ABC≅△ADC under SAS congruence criterion.

<h2>\color{plum}\boxed{ \: \tt Reasons : }</h2>
  1. It is given.
  2. It is given.
  3. It is given. They are also equal because the bisector AC bisects angle BAD and divides it into two equal angles which are angle B and angle D.
  4. It is given.
  5. Common side.
  6. Common angle.
  7. Two angles and one included side is equal so these two triangles are congruent under the ASA congruence criterion.
  8. Two sides and one included side is equal so these two triangles are congruent under the SAS congruence criterion as well.

<h3>Steps to derive these statements and reasons :</h3>

Given :

  • segment AB = segment AD
  • segment BC = segment DC
  • ∠B =∠D
  • segment AC bisects ∠BAD

This means that △ABC≅△ADC under the SAS congruence criterion because according to this criterion if two sides and one included angle is equal two triangles are congruent and since these two triangles fulfill these rules they are said to be congruent under the SAS congruence criterion. But they are also congruent under the ASA congruence criterion which states that if two angles and one included side is equal two triangles are congruent. Since △ABC and △ADC fulfill these rules too they can said to be congruent under the ASA congruence criterion.

4 0
3 years ago
isted below are amounts​ (in millions of​ dollars) collected from parking meters by a security service company and other compani
AlladinOne [14]

Answer:

Means:

1.55

1.73

Standard Deviation:

0.1434

0.1338

Coefficient of variation:

9.2

7.7

the limited data listed here shows evidence of stealing by the security service​ company's employees.

Step-by-step explanation:

Given data:

security Service Company          Other Companies    

               x₁                                                 x₂

               1.5                                              1.8

               1.7                                               1.9

               1.6                                               1.6

               1.4                                                1.7

               1.7                                                 1.8

               1.5                                                 1.9

               1.8                                                 1.6

               1.4                                                  1.5

               1.4                                                  1.7

               1.5                                                  1.8

      n₁ = 10                                                 n₂ = 10

To find:

coefficient of variation for each of the two​ samples

Solution:

The formula for calculating coefficient of variation of sample is:

Coefficient of Variation (CV) = (Standard Deviation / Mean) * 100%

Calculate Mean for Security Service Company data:

Mean =  (Σ x₁) / n₁

         = (1.5 + 1.7 + 1.6 + 1.4 + 1.7 + 1.5 + 1.8 + 1.4 + 1.4 + 1.5) / 10

         = 15.5 / 10

Mean = 1.55

Calculate Standard Deviation for Security Service Company data:

Standard Deviation = √∑(x₁ - Mean)²/n₁-1

                                = √∑(1.5-1.55)² + (1.7-1.55)² + (1.6-1.55)² + (1.4-1.55)² + (1.7-1.55)² + (1.5-1.55)² + (1.8-1.55)² + (1.4-1.55)² + (1.4-1.55)² + (1.5-1.55)² / 10-1

=√∑ (−0.05)² + (0.15)² + (0.05)² + (−0.15)² + (0.15)² + (−0.05)² + (0.25)² +  (−0.15)² +  (−0.15)² +  (−0.05)² / 10 - 1

= √∑0.0025 + 0.0225 + 0.0025 + 0.0225 + 0.0225 + 0.0025 + 0.0625 +        0.0225 + 0.0225 + 0.0025 / 9

= √0.185 / 9

= √0.020555555555556

= 0.14337208778404

= 0.143374

Standard Deviation = 0.143374

Coefficient of Variation for Security Service Company:

CV = (Standard Deviation / Mean) * 100%

     = (0.143374 /  1.55) * 100

     = 0.09249935 * 100

     = 9.249935

CV  = 9.2

CV  = 9.2%

Calculate Mean for Other Companies data:

Mean =  (Σ x₂) / n₂

          =  (1.8 + 1.9 + 1.6 + 1.7 + 1.8 + 1.9 + 1.6 + 1.5 + 1.7 + 1.8) / 10

          =   17.3 / 10

Mean  = 1.73

Calculate Standard Deviation for Other Companies data:

Standard Deviation = √∑(x₂-Mean)²/n₂-1

                                = √∑[(1.8-1.73)² + (1.9-1.73)² + (1.6-1.73)² + (1.7-1.73)² + (1.8-1.73)² + (1.9-1.73)² + (1.6-1.73)² + (1.5-1.73)² + (1.7-1.73)² + (1.8-1.73)²] / 10 - 1

                                = √∑ [(0.07)² + (0.17)² + (-0.13)² + (-0.03)² + (0.07)² + (0.17)² + (-0.13)² + (-0.23)² + (-0.03)² + (0.07)²] / 9

                                = √∑ (0.0049 + 0.0289 + 0.0169 + 0.0009 + 0.0049 + 0.0289 + 0.0169 + 0.0529 + 0.0009 + 0.0049) / 9

                                = √(0.161 / 9)

                                = √0.017888888888889                                

                                = 0.13374935098493

                                =  0.13375

Standard Deviation = 0.13375

Coefficient of Variation for Other Companies:

CV = (Standard Deviation / Mean) * 100%

     = (0.13375 / 1.73) * 100

     = 0.077312 * 100

     = 7.7312

CV = 7.7

CV = 7.7%

Yes, the limited data listed here shows evidence of stealing by the security service​ company's employees because there is a significant difference in the variation.

6 0
4 years ago
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