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emmainna [20.7K]
3 years ago
11

Which is a true statement?

Mathematics
1 answer:
BaLLatris [955]3 years ago
7 0
C.  the smaller the negative is the greater the value is. For example -1>-2 because it is greater on a number line.  
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The Environmental Protection Agency (EPA) publishes fuel economy values that are known to be good estimates of the fuel economy
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Answer:

The 90% confidence interval for the mean combined fuel economy for Ford Explorers is between 22.95 and 23.63 mpg.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 16 - 1 = 15

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 15 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.9}{2} = 0.95. So we have T = 1.7531

The margin of error is:

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The upper end of the interval is the sample mean added to M. So it is 23.29 + 0.34 = 23.63 mpg

The 90% confidence interval for the mean combined fuel economy for Ford Explorers is between 22.95 and 23.63 mpg.

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shtirl [24]

Given:

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To find:

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We have, \dfrac{2}{10} divded by \dfrac{2}{4}. It can be written as

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