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3 years ago

Find the lengths of HJ

Mathematics

1 answer:

attashe74 [19]3 years ago

4 0

Answer:

What's HJ? Never heard of it

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Find the equation of the line.<br> Use exact numbers

klemol [59]

The answe is y=7 + -6

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3 years ago

Calculating the degrees of freedom, the sample variance, and the estimated standard error for evaluations using the t statistic

Yuliya22 [10]

Answer:

a) For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

b) $s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

c) For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

Step-by-step explanation:

Part a

For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

Part b

From a sample we know that n=41 and SS= 600, where SS represent the sum of quares given by:

$SS = \sum_{i=1}^n (X_i -\bar X)^2$

And the sample variance for this case can be calculated from this formula:

$s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

Part c

For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

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3 years ago

On average,Anna can drive 31 miles on every gallon of gasoline. If you fills up her tank for $2.19 per gallon, how much will it

Alex Ar [27]

Answer:

30.60

Step-by-step explanation:

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3 years ago

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Two arrows are launched at the same time with the same speed. arrow a at an angle greater than 45 degrees, and arrow b at an ang

valentina_108 [34]

Let V = the launch velocity
Let θ = the launch angle
Let d = the horizontal distance traveled

Ignore air resistance.

The horizontal component of velocity is
u = V cos θ
The time of flight is
t = d/(V cosθ) = (d/V) secθ

Create a table of θ versus t as shown below.
θ t/(d/V)
---- ----------
45 1.4142
40 1.3054
35 1.2208
30 1.1547

The graph shows that as the launch angle decreases below 45°, the time of flight decreases.
Therefore arrow b (θ < 45°) arrives first.

Answer: Arrow b arrives first.

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3 years ago

What is the y-intercept of the line?

kramer

Answer:

the y intercept would be 4 pr (0,4)

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2 years ago

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