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olasank [31]
3 years ago
6

We have calculated a 95% confidence interval and would prefer for our next confidence interval to have a smaller margin of error

without losing any confidence. In order to do this, we can ________.
I. change the z* value to a smaller number.
II. take a larger sample.
III. take a smaller sample.
Which is the correct answer from above? There can be more than one.
Mathematics
1 answer:
stepladder [879]3 years ago
3 0

Answer:

asdfghjkl

Step-by-step explanation:

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Answer:

Test Cross , 50% to 50%

Step-by-step explanation:

just took the test yw

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2 years ago
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What is the quotient?
Goryan [66]

Answer:

1/9

Step-by-step explanation:

this is (-3)^(0-2) = (-3)^(-2) = 1 / 9.

6 0
3 years ago
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Angela is buying a dress that is on sale for 20% off. If the original price of the dress is $40.00, how much money is Angela sav
neonofarm [45]
The answer is D, 8$. One easy way to do it is to take 10% of 40, which is 4, and double it.
8 0
3 years ago
A 140 kg camera is suspended by two wires over a 40 metre wide football field to get shots of the action from above. At one poin
Katen [24]

Answer:

Please red the answer below

Step-by-step explanation:

In order to determine the length of each cable you use the Newton second law for each component of the forces involved in the situation.

For the x component you have:

T_1cos\theta_1-T_2cos\theta_2=0           (1)

T1: tension of the first cable = 1500N

T2: tension of the second cable = 800N

θ1: angle between the horizontal and the first cable

θ2: angle between the horizontal and the first cable

For the y component you have:

T_1sin\theta_1+T_2sin\theta_2-W=0               (2)

W: weight of the camera = Mg = (140kg)(9.8m/s^2) = 1372N

You can squared both equations (1) and (2) and the sum the two equations:

T_1^2cos^2\theta_1=T_2^2cos^2\theta_2\\\\T_1^2sin^2\theta_1=T_2^2sin^2\theta_2-2WT_2sin\theta_2+W^2

Then, you sum the equations:

T_1^2(cos^2\theta_1+sin^2\theta_1)=T_2^2(sin^2\theta_2+cos^2\theta_2)-2Wsin\theta_2+W^2        (3)

Next, you use the following identity:

sin^2\theta+cos^2\theta=1

and you obtain in the equation (3):

T_1^2=T_2^2-2WT_2sin\theta_2+W^2\\\\sin\theta_2=\frac{T_2^2-T_1^2+W^2}{2WT_2}=\frac{(800N)^2-(1500)^2+(1372N)^2}{2(800N)(1372N)}=0.066\\\\\theta_2=sin^{-1}0.066=27.23\°

With this values you can calculate the value of the another angle, by using the equation (1):

\theta_1=cos^{-1}(\frac{T_2cos(27.23\°)}{T_1})=cos^{-1}(\frac{(800N)(cos27.23\°)}{1500N})\\\\\theta_1=61.69\°

Now, you can calculate the length of each cable by using the information about the width of the football field. You use the following trigonometric relation:

l_1cos\theta_1=40-d\\\\l_2cos\theta_2=d\\\\

d: distance to the right side of the field

By using the cosine law you can fins a system of equation and then you can calculate the values of l1 and l2.

3 0
3 years ago
Amy sells bracelets for two dollars each. She is charged $7 to rent a booth at a craft fair.
Studentka2010 [4]

Answer:

Y means profits and x is the number sold.

Step-by-step explanation:

(2$ times x) - 7=y.

6 0
3 years ago
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