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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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Given the following expressions:
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Step-by-step explanation:

Step 1:

A .    5 with an exponent of 3 times 5 with an exponent of -4

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B .   (1/4) with an exponent of 3 times (1/4) with an exponent of 2

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C. Same as above

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3 0
4 years ago
Which algebraic expression represents “the difference of fifty-four and seven times a number”? 54 minus 7 n StartFraction 54 Ove
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Answer: 54-7n

Step-by-step explanation:

When we talk about mathematical language, the <u>difference </u>between two numbers, quantities or terms is the <u>substraction operation.</u>

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a-b

On the other hand, if we read a numer c <u>times</u> a number n, this means both numbers are multiplied.

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So, according to the explained above, “the difference of fifty-four and seven times a number n” is:

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8 0
3 years ago
Read 2 more answers
9/16+5/12= help asap
navik [9.2K]

\frac{9}{16}  +  \frac{5}{12}  =  \frac{27}{48}  +  \frac{20}{48} =  \frac{47}{48}
8 0
3 years ago
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20. An amount of money was shared among five boys Ali, Juma, Musa, Khalid and Mustafa. Ali got /8 of the total amount while Juma
Nadusha1986 [10]

Answer:

x=\frac{18000}{7}=2571\frac{3}{7}

Step-by-step explanation:

Let the total amount be x

Then Ali got 1/8x With 7/8x left

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since \frac{7}{30}x=600

7x=18000

x=\frac{18000}{7}=2571\frac{3}{7}

3 0
2 years ago
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