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MArishka [77]
3 years ago
12

Can someone help me im confused

Mathematics
1 answer:
skelet666 [1.2K]3 years ago
4 0

Answer:

you have some bad hand writing repost as typed pls

Step-by-step explanation:


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The Environmental Protection Agency (EPA) publishes fuel economy values that are known to be good estimates of the fuel economy
r-ruslan [8.4K]

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:

M = T\frac{s}{\sqrt{n}} = 1.7531\frac{0.78}{\sqrt{16}} = 0.34

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 23.29 - 0.34 = 22.95 mpg

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.

7 0
3 years ago
Round off 6 337 927 to 3 significant figures​
Marianna [84]

Answer:6340000

Step-by-step explanation:

6 0
2 years ago
This timeframe shows 5+8 Draw to make 10. then write the new fact
snow_lady [41]
13 you add both of the factors
6 0
3 years ago
Evaluate (4p)3 when p = (-1)
Leona [35]

Answer:

-12

Step-by-step explanation:

plug in -1 into the equation which is going to be (4*-1)3

you multiply what is in the parenthesis first and after is going to be (-4)3

lastly your going to multiply -4*3 and it is going to equal to -12.

3 0
3 years ago
How to solve this problem
finlep [7]

the answer  is 134 and the Remainder is 19

6 0
3 years ago
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