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3 years ago

7

Need help please anything will help.!!!?!?!

1 answer:

yaroslaw [1]3 years ago

8 0

Answer:

84.78 cubic feet it is the correct answer

please mark brainlist

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Line M is represented by the equation -2/3+8. Line W is perpendicular and passes through the point (4,3)

goblinko [34]

Answer:

y= -3/2x+9

Step-by-step explanation:

Well we have to know that to find a line perpendicular to a given line, you have to have opposite slopes. So that makes the equation begin as y=-3/2x because it's opposite of y=2/3x. Then we have to make sure it goes through the point (4,3). To do that, I tweaked the numbers in my graphing calculator and it worked with 9! So the equation is y= -3/2x+9

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3 years ago

Three-dimensional objects are measured by their length, width and what

slava [35]

Answer:

height

Step-by-step explanation:

you can just look these questions up

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3 years ago

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A bike shop has bicycles and tricycles in stock. In total he has 21 items in stock with a total of 51 wheels. Can you tell

stira [4]

Answer:

21 bikes and 3 tricycles

Step-by-step explanation:

21 items

51 wheels

42 wheels=21 bikes

51-42=9

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3 years ago

There are eight 4th grader class going on a field trip there are 20 students in each class and 22 adults who plan to go each bus

kodGreya [7K]

Answer:

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Step-by-step explanation:

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2 years ago

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You are going to estimate how long a person holds down a button on their calculator by randomly selecting people and asking them

Ray Of Light [21]

Answer:

You need to have 538 people in your study.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.94}{2} = 0.03$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.03 = 0.97$ , so Z = 1.88.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

You practiced on the people at work and found a standard deviation of about 0.37 seconds.

This means that $\sigma = 0.37$

You want to get a 94% confidence interval that is only 0.06 in width.

This means that $M = \frac{0.06}{2} = 0.03$

How many people do you need to have in your study?

This is n for which M = 0.03. So

$M = z\frac{\sigma}{\sqrt{n}}$

$0.03 = 1.88\frac{0.37}{\sqrt{n}}$

$0.03\sqrt{n} = 1.88*0.37$

$\sqrt{n} = \frac{1.88*0.37}{0.03}$

$(\sqrt{n})^2 = (\frac{1.88*0.37}{0.03})^2$

$n = 537.6$

Rounding up:

You need to have 538 people in your study.

7 0

3 years ago