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Nimfa-mama [501]
3 years ago
13

Mileage tests are conducted for a particular model of automobile. If a 98% confidence interval with a margin of error of 1 mile

per gallon is desired, how many automobiles should be used in the test? Assume that preliminary mileage tests indicate the standard deviation is 2.6 miles per gallon. Anderson, David R.. Essentials of Statistics for Business and Economics (p. 377). South-Western College Pub. Kindle Edition.
Mathematics
1 answer:
Llana [10]3 years ago
7 0

Answer: 37

Step-by-step explanation:

Given : Significance level : \alpha:1-0.98=0.02

Critical value : z_{\alpha/2}=z_{0.01}=2.33

margin of error : E= 1 mile per gallon

Population standard deviation: \sigma=2.6 miles per gallon.

We know that when the population standard deviation is known then the formula to find the sample size is given by  :

n=(\dfrac{z_{\alpha/2}\times \sigma}{E})^2

n=(\dfrac{(2.33)\times 2.6}{1})^2=36.699364\approx37  [Round to the next whole number.]

Hence, the required number of automobiles should be used in the test = 37

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3 years ago
(HELP) What is the domain and range of this parabola?
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Answer:

D: [0,8]

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Step-by-step explanation:

The domain is the x-values covered by the graph, while the range is the y-values. So to find each, find the lowest and highest x and y value; since this graph is continuous the domain and range will include all values between these points. In this case, the lowest x is 0 and the highest is 8; the lowest y is 0 and the highest is 3. Then to write the answer write is from least to greatest, finally, surround the point by a parenthesis or bracket. The difference is that parenthesis means the value is not included while a bracket means it is. On this graph all points are included, therefore brackets should be used.

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2 years ago
What is 5/8 divided by 32
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7 0
3 years ago
Explain and answer please throughlly explain. I got 7 with a remainder of 3 halp. I think its .73 idk.
kipiarov [429]

Answer:

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Step-by-step explanation:

4.5 divided by 6 is 0.75

We don't use remainders in algebra for the most part.  We have to do regular division.  I'll try to show it here:

   

   ____._7___5_____________

6 ) 4    .    5     0

    4    .     2

 ____________

    0   .     3    0

    0  .      3    0

  _____________

                      0

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Fynjy0 [20]
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3 years ago
Read 2 more answers
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