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DerKrebs [107]
3 years ago
13

NEED HELP ASAP!The maker of a cell phone screen protector would like to estimate the proportion of customers who file a warranty

claim. To do so, they select a random sample of 200 customers and determine that the 96% confidence interval for the true proportion of customers who file a warranty claim to be 0.15 to 0.28. Which of the following can be accounted for by the margin of error of this interval?
response bias
nonresponse bias
sampling variation
undercoverage bias
Mathematics
1 answer:
BartSMP [9]3 years ago
4 0

Answer: sampling variation

Step-by-step explanation: took the quiz

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The intersection of a line and a plane is..
WINSTONCH [101]

Answer:

See below in bold.

Step-by-step explanation:

Intersection of a line and a plane is a point.

Intersection of two planes: it is a line.

The least amount of non-collinear points is 3.

2 lines on the same plane which never intersect  are parallel.

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Factor the trinomial below.
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Product= the result of two numbers being multiplied together.
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c) (x-5) (x-7)

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Step-by-step explanation:

6

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Please help me with these calculus bc questions
zhannawk [14.2K]

4. Compute the derivative.

y = 2x^2 - x - 1 \implies \dfrac{dy}{dx} = 4x - 1

Find when the gradient is 7.

4x - 1 = 7 \implies 4x = 8 \implies x = 2

Evaluate y at this point.

y = 2\cdot2^2-2-1 = 5

The point we want is then (2, 5).

5. The curve crosses the x-axis when y=0. We have

y = \dfrac{x - 4}x = 1 - \dfrac4x = 0 \implies \dfrac4x = 1 \implies x = 4

Compute the derivative.

y = 1 - \dfrac4x \implies \dfrac{dy}{dx} = -\dfrac4{x^2}

At the point we want, the gradient is

\dfrac{dy}{dx}\bigg|_{x=4} = -\dfrac4{4^2} = \boxed{-\dfrac14}

6. The curve crosses the y-axis when x=0. Compute the derivative.

\dfrac{dy}{dx} = 3x^2 - 4x + 5

When x=0, the gradient is

\dfrac{dy}{dx}\bigg|_{x=0} = 3\cdot0^2 - 4\cdot0 + 5 = \boxed{5}

7. Set y=5 and solve for x. The curve and line meet when

5 = 2x^2 + 7x - 4 \implies 2x^2 + 7x - 9 = (x - 1)(2x+9) = 0 \implies x=1 \text{ or } x = -\dfrac92

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\dfrac{dy}{dx} = 4x + 7

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8. Compute the derivative.

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so that

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5 0
2 years ago
Solve the system by substitution.<br> -2y = x<br> 7x+9y = -45
Soloha48 [4]

Answer:

9

Step-by-step explanation:

substitute the value

7 0
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