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inn [45]
4 years ago
13

Which is greater than 4.026?

Mathematics
1 answer:
schepotkina [342]4 years ago
3 0

Answer:

4.020

4.030

4.021

4.006

Step-by-step explanation:

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In a study to establish the absolute threshold of hearing, 80 male college freshmen were each seated in a soundproof room and a
Norma-Jean [14]

Answer:

Step-by-step explanation:

Hello!

To study the threshold of hering the researcher took a random sample of 80 male college freshmen.

The students underwent an audiometry test where a tome was played and they had to press a button when they detected it.  The researcher recorded the lowest stimulus level at which the tone was detected obtaining a sample mean of X[bar]= 22.2 dB and a standard deviation of S= 2.1 dB

To estimate the population mean, since we don't have information about the variable distribution but the sample size is greater than 30, you can use the approximation of the standard normal distribution:

X[bar] ± Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Where the semiamplitude or margin of error of the interval is:

d= Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

Using a 95% level Z_{0.975}= 1.965

d= 1.965 * \frac{2.1}{\sqrt{80} }

d= 0.46

The point estimate of the population mean of the threshold of hearing for male college freshmen is X[bar]= 22.2 db

And the estimation using a 95%CI is [21.74;22.66]

I hope this helps!

8 0
3 years ago
We are given arc KL is 12x+4, arc KJ is 8x-6, and angle E is 99 degrees. What is the actual degree measure of arc KJ? *
Svetlanka [38]

The  actual degree measure of arc KJ is 99 degrees

<h3>Circle geometry</h3>

From the given informtion

arc KL = 12x+4

arc KJ = 8x-6

<E = 99 degrees

The equation required to get the value of "x" is given as:

12x + 4 + 8x - 6 + 99 = 360

20x + 97 = 360

20x = 360 - 97

20x = 263

x = 13.15

For the arcKL

arcKJ = 8(13.15) -  6

arcKJ = 99degrees

HEnce the  actual degree measure of arc KJ is 99 degrees

learn more on circle geometry here: brainly.com/question/24375372

5 0
3 years ago
What is the inverse of the function f(x)=2x+1​
riadik2000 [5.3K]

Answer:

Step-by-step explanation:

To find the inverse function, the first step we do is change f(x) to Y. So now, we have

y=2x+1

Now that we have this function, we simply flip x and y. When we do that, we get

x=2y+1

Now that we have this function, we just solve for Y. We do that by bring 1 to the other side by subtracting it from both sides, then dividing both sides by 2.

x-1=2y+1-1

x-1=2y

(x-1)/2=2y/2

(x-1)/2=y

So, our inverse function is:

y=(x-1)/2, or y=x/2 - 1/2

Hope I helped!

7 0
4 years ago
What is the slope for -4x-3y=6
loris [4]

Answer: y=4/3x+2


Step-by-step explanation:

-4x-3y=6

+4x       +4x

-3y=4x+6

-3/-3=4/3+6/3

y=4/3x+2


7 0
3 years ago
1. Fill in the blanks: For the line 3.x - y = 2, the x-intercept is<br> and the y-intercept is-
Allushta [10]

Answer:

x-intercept: (2/3, 0)

y-intercept: (0, -2)

Step-by-step explanation:

x-intercept: when y = 0

3x - y = 2

3x - 0 = 2

x = 2/3

y-intercept: when x = 0

3x - y = 2

0 - y = 2

y = -2

4 0
3 years ago
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