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Naya [18.7K]
3 years ago
7

It is recommended that adults get 8 hours of sleep each night. A researcher hypothesized college students got less than the reco

mmended number of hours of sleep each​ night, on average. The researcher randomly sampled 20 college students and calculated a sample mean of 7.5 hours per night. If the researcher wanted to perform a​ one-sample t-test, which of the following is a correct​ statement?
A: By taking a random​ sample, the researcher has guaranteed that the distribution of number of hours of sleep per night for all college students is normal.
B.The number of hours of sleep per night for all college students must be normally distributed because the sample size is small.
C.By taking a random​ sample, the researcher has guaranteed that the distribution of sample means is normal.
D.The distribution of sample means will be normal even if the distribution of the data in the population is not normal.
Mathematics
1 answer:
Artist 52 [7]3 years ago
7 0
Things change, rearrange, or so do I
It ain't always for the better dawg, I can't lie
I get high cause the lows can be so cold
I might bend a little bit but I don't fold
One time for my mind and two for yours
I got food for your thoughts to sooth your soul
If you see my tears fall just let me be..
Move along, nothing to see
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Find the value of x in (4x -5) = 7(x -5)​
Vlad1618 [11]

Answer: x = 10

Step-by-step explanation:

( 4 x − 5 ) = 7 ( x − 5 )

Simplify  7 ( x − 5 ) .

4 x − 5 = 7 x − 35

Move all terms containing  x  to the left side of the equation.

− 3 x − 5 = − 35

Move all terms not containing  x  to the right side of the equation.  

− 3 x = − 30

Divide each term by   − 3  and simplify.

x = 10

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3 years ago
You purchase a lottery ticket for $2 from a grocery store. There are a total of 100,000 tickets in circulation. The grand prize
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I'm pretty sure its B but I would double check before you put the answer in :)
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Find f(x) and g(x) so that the function can be described as y = f(g(x)). <br><br> y = 7/sqrt 8x +10
Blizzard [7]
Assuming you meant

y =  \frac{7}{ \sqrt{8x+10} }

Then you can compose the function g(x)

g(x)= \sqrt{8x+10}

With the function

f(x)= \frac{7}{x}


Because f (g(x) ) means that you first find (calculte)     \sqrt{8x+10}       and second you divide 7 by g(x) to obtain 7 / [√(8x+10) ].
8 0
3 years ago
In a group of 35 students, 11 study both Art and Biology 11 study Biology but not Art. 10 study neither subject. Given that a ra
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Answer:

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3 years ago
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Estimate the solution of the system x+y=4 2x-y=6 by sketching a graph of each linear function. Then solve the system algebraical
Juli2301 [7.4K]

Answer:

(10/3, 2/3)

Step-by-step explanation:

You may find it easier to write these two equations x+y=4 2x-y=6 in a column:

x+y=4

2x-y=6

Adding these together will eliminate y:

3x = 10.  Then x = 10/3.

Substituting 10/3 for x in the first equation results in:

10/3 + y = 4

Clear fractions by multiplying all three terms by 3:

10 + 3y = 12

Then 3y = 2, and y = 2/3.

The solution is (10/3, 2/3)

8 0
3 years ago
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