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V125BC [204]
4 years ago
13

Suppose you are interested in determining if the average amount of money that students spend on food at your university per day

is greater than $30. You randomly choose 25 students from your campus and calculate that the mean amount of money spent per day is $18.01 with a standard deviation of $2.22. What is the standard error of the mean?
Mathematics
1 answer:
aivan3 [116]4 years ago
6 0

Answer:

<u>The standard error of the mean is 0.444</u>

Step-by-step explanation:

1. Let's review the information given to us for solving the question:

Size of the sample = 25

Mean amount of money spent per day = US$ 18.01

Standard deviation  =  US$ 2.22

2. For finding the standard error of the mean, we use the following formula:

Standard error = Standard deviation / √Size of the sample

Standard error = 2.22 / √25

Standard error = 2.22 / 5

<u>Standard error = 0.444</u>

3. Interpretation of the standard error:

The standard error is "the standard deviation of the population of values of a sample statistic in a repeated sampling or its estimate".

Thus, the potential for error in the reported result is not more than ± 0.444 (68% confidence) or no more than 1.96 times the standard error (0.444) = ± 0.87 (at 95% confidence).

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solniwko [45]
The answer is: 13 units.  
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Each side of the park is 13 units long.
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(Assuming hexagonal shape will have 6 (SIX) sides of equal length).
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Explanation:
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Let us assume you meant to write that the: "...new park, in the shape of hexagon, will have 6 (six) side of equal length."
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Here is one way to solve the problem:  Find the length of ONE side of the hexagon.
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Let us choose the following coordinates: (18,0), and (6.5, 5).  Let the distance between these points , which would equal ONE side of our hexagon, represent "c", the hypotenuse of a right triangle. We want to solve for this value, "c".
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Let the distance on the x-axis, from (6.5, 0) to (18.5, 0);  represent "b", one side of a right triangle.  
   → We can solve for "b" ;  → b = 18.5 - 6.5 ;  → b = 12 .
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Let the distance from (6.5, 0) to (6.5, 5) ; represent "a"; the remaining side of the right triangle.
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 → a = y₂ - y₁ = 5 - 0 = 5 ; 
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{Note: We choose the particular coordinates, including "(6.5, 0)", because the distances between the coordinates chosen form a "right triangle";  (with "c", representing a "hypotenuse", or "slanted line segment"; which would be also be "ONE line segment of the given regular hexagon", which is our answer, because each line segment is the same values, so we only have to find the value of ONE line segment, or side, of the hexagon.).
    When considering the given coordinates: "(6.5, 5)", and "(18.5, 0)", a "right triangle" can be formed at the coordinate, "(6.5, 0),

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 → a² + b² = c² ; in which "c" represents the hypotenuse of the right triangle
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We have: a = 5 ;  b = 12 ; → Solve for "c" ; 
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 → a² + b² = c² ;  ↔  c² = a² + b²  ; Plug in the known values for "a" & "b" ;
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→ c² = a² + b² ;  → c² = 5² + 12² ;

→ c² = 25 + 144 = 169 ;   →  c²  = 169 ;
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4 years ago
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You can put this solution on YOUR website!
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