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denis23 [38]
3 years ago
7

An experiment involves selecting a random sample of 256 middle managers for study. One item of interest is their annual income.

The sample mean is computed to be $35,420. If the population standard deviation is $2,050, what is the standard error of the mean
Mathematics
1 answer:
yulyashka [42]3 years ago
4 0

Answer:

SE=$128.13

Step-by-step explanation:

-Given the sample mean is $34,250 and standard deviation is $2,050 with n=256:

-Standard error is calculated using the formula:

SE=\frac{s}{\sqrt{n}}

Where s is the sample standard deviation.

#We substitute our values to solve for SE:

SE=\frac{s}{\sqrt{n}}\\\\=\frac{2050}{\sqrt{256}}\\\\=128.125\approx128.13

Hence, the standard error is $128.13

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Akimi4 [234]

1035.33156649 meters high is the helicopter flying over the building.

Given that, an observer (O) is located 900 feet from a building (B). The observer notices a helicopter (H) flying at a 49° angle of elevation.

We need to find how high is the helicopter flying over the building.

<h3>How to find the height of the building using trigonometry?</h3>

To measure the heights and distances of different objects, we use trigonometric ratios.

Here, use the Tangent rule to calculate the height of the building.

tan(angle) = opposite/adjacent

Now, tan 49°=h/900

⇒h=1035.33156649 meters

Therefore, 1035.33156649 meters high is the helicopter flying over the building.

To learn more about the angle of elevation visit:

brainly.com/question/21137209.

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3 0
2 years ago
How do you get a factor pair?
Sedaia [141]
<span>1. Find all factor pairs of a number using a t-chart.
2.Find all the factor pairs of a number using area models.
3.Determine if a number is prime or composite using area models. 
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4 0
3 years ago
Point Q is the center of dilation. Lines segment S U is dilated to form line segment S prime U prime. The length of Q S is 3 .2
tia_tia [17]

Answer:

Option C.

Step-by-step explanation:

It is given that the dilation rule is D_{Q,2.5}. It means the center of dilatation is point Q and scale factor is 2.5.

Scale factor is the ratio of distance from center to the image of a point and distance from center to the corresponding point.

\text{Scale factor}=\dfrac{QU'}{QU}

It is given that QU=4 and scale factor = 2.5.

2.5=\dfrac{QU'}{4}

Multiply both sides by 4.

2.5\times 4=QU'

10=QU'

We know that

UU'=QU'-QU

UU'=10-4

UU'=6

The distance between U' and U is 6 units.

Therefore, the correct option is C.

8 0
3 years ago
Read 2 more answers
What is the first step in solving for zin equation 5z - 4 = 26
aksik [14]

Answer:

add 4 on both sides

Step-by-step explanation:

7 0
3 years ago
Solve X/3+5=9 pls give me answer​
dalvyx [7]
The answer is x= 12.
5 0
2 years ago
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