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Novosadov [1.4K]
2 years ago
15

I have no idea how to do these. please help me solve #9-11

Mathematics
1 answer:
madreJ [45]2 years ago
5 0

Answer: i am not good at this but i think it is this

Step-by-step explanation:

umm it mit be #0-

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The mean number of hours of flying time for pilots at Continental Airlines is 49 hours per month. Assume that this mean was base
Effectus [21]

Answer:

a) 17.09 hours

b) The 95% confidence interval estimate of the population mean flying time for the Pilots is between 31.91 hours and 66.09 hours

Step-by-step explanation:

We have the standard deviation of the sample, so we use the t distribution 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 = 49 - 1 = 48

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 48 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2.0106

The margin of error is:

M = T*s = 2.0106*8.5 = 17.09

s is the standard deviation of the sample. 17.09 hours is the answer for a.

The lower end of the interval is the sample mean subtracted by M. So it is 49 - 17.09 = 31.91 hours

The upper end of the interval is the sample mean added to M. So it is 49 + 17.09 = 66.09 hours

The 95% confidence interval estimate of the population mean flying time for the Pilots is between 31.91 hours and 66.09 hours

8 0
3 years ago
Kylie just accepted a job at a new company where she will make an annual salary of
Softa [21]

Answer:

$73,000

$43,000 + $5,000 x t

Step-by-step explanation:

Every year increase $5,000, after 6 years increase $5000 x 6 = $30,000

Her salary will be $43,000 + $30,000 = $73,000

After t years, her salary will be

$43,000 + $5,000 x t

4 0
2 years ago
Suppose Barbara has a 20 minute commute and scores 67.4 on the survey. Is Barbara more 'well-off than the typical individual who
Natalka [10]

Please find full question attached Answer:

Barbara is not more well off as the typical individual has a higher well being score

Explanation:

please find explanation attached

5 0
3 years ago
Here is the next one jaded :))
Ksju [112]

Answer:

x = 5.56

Step-by-step explanation:

Sin(17) = \frac{x}{19}

=> Isolate the "x"

Sin(17) * 19 = x

5.56 = x

Hope this helps!

6 0
3 years ago
Please help! It is Geometry
djyliett [7]

Answer:

X=20; pqr = 130°

Step-by-step explanation:

They key here is to notice that the instructions say that qs bisects pqr, meaning that it evenly cuts it into 2 pieces. So, to find x, you just solve for x in the equation 3x+5=2x+25. Then, you plug it back into either side of the equation, at which point, you should get 65. Since it is half of pqr, just double it to get your final answer of 130°

5 0
3 years ago
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