What is the slope of this graph?

You are trying to estimate the average amount a family spends on food during a year. In the past the standard deviation of the a

svetoff [14.1K]

Answer:

$n=(\frac{2.58(1000)}{50})^2 =2662.56 \approx 2663$

So the answer for this case would be n=2663 rounded up to the nearest integer

Step-by-step explanation:

We have the following info:

$ME = 50$ margin of error desired

$\sigma = 1000$ the standard deviation for this case

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =50 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 99% of confidence interval now can be founded using the normal distribution. The significance is $\alpha=0.01$ . And for this case would be $z_{\alpha/2}=2.58$ , replacing into formula (b) we got:

$n=(\frac{2.58(1000)}{50})^2 =2662.56 \approx 2663$

So the answer for this case would be n=2663 rounded up to the nearest integer

5 0

3 years ago

Quadrilateral ABCD is similar to quadrilateral A'B'C'D'. Write 2 equations that could be used to solve for missing lengths?

deff fn [24]

Answer:

Rectangle, trapezoid, quadrilateral

Step-by-step explanation:

The quadrilateral is a parallelogram with perpendicular diagonals

7 0

3 years ago

Can someone please answer this ‍♀️

Marianna [84]

A) JL and JK

Because you must always start from top to bottom and left to right.

7 0

3 years ago

If a represents Jim's current age, then which expression represents Jim's age eight years ago?

Veronika [31]

Answer:

D

Step-by-step explanation:

5 0

3 years ago

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What is the standard form for 25x²+4y²+50x-24y-39=0

Thepotemich [5.8K]

25x² + 4y² + 50x - 24y - 39 = 0
25x² + 50x + 4y² - 24y - 39 = 0
25x² + 50x - 39 = 0 4y² - 24y - 39 = 0
x = -b + √b² - 4ac y = -b + √b² - 4ac
 2a 2a
x = -50 + √(-50)² - 4(25)(-39) y = -(-24) + √-(-24)² - 4(4)(-39)
 2(25) 2(4)
x = -50 + √2500 + 3900 y = 24 + √-576 + 624
 50 8
x = -50 + √6400 y = 24 + √48
 50 8
x = -50 + 80 y = 24 + √16 × 3
 50 8
x = -50 + 80 y = 24 + √16 √3
 50 8 
x = -50 + 80 y = 24 + 4 √3
 50 8
x = -50 + 80 y = 24 + 4 √3 
 50 8
x = -50 + 80 x = -50 - 80 y = 24 + 4 √3 y = 24 - 4 √3
 50 50 8 8
x = 30 x = -130 y = 28 √3 y = 20 √3
 50 50 8 8
x = 3 x = -13 y = 28 √3 y = 20 √3
 5 5 8 8
(x, y) = (3, 26 √3) (x, y) = (-13, 20 √3 )
 5 8 5 8

8 0

4 years ago

Read 2 more answers