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2 years ago

A school counselor heard that teenagers sleep an average of 9 hours per night on the weekend. The counselor

Mathematics

1 answer:

Katen [24]2 years ago

7 0

Answer:

H0:μ=9 hours Ha:μ not equal to 9 hours

Step-by-step explanation:

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The mean and standard deviation of the number of practices are = 8 practices and sx = 4.47 practices. The mean and standard devi

ddd [48]

Least square regressions are used to find the equation of <em>best fit between two variables</em>.

The equation of the least-squares regression line is: $\mathbf{y = 9.414 - 0.213x}$

The given parameters are:

$\mathbf{\bar x = 8}$

$\mathbf{\sigma_x = 4.47}$

$\mathbf{\bar y = 7.71}$

$\mathbf{\sigma_y = 1.20}$

$\mathbf{r = -0.793}$

The equation of the least-squares regression line is represented as:

$\mathbf{y = a + bx}$

Where:

$\mathbf{b = r \times \frac{\sigma_y}{\sigma_x}}$

$\mathbf{a = \bar y - b\bar x}$

So, we have:

$\mathbf{b = r \times \frac{\sigma_y}{\sigma_x}}$

$\mathbf{b = -0.793 \times \frac{1.20}{4.47}}$

$\mathbf{b = -0.213}$

$\mathbf{a = \bar y - b\bar x}$

$\mathbf{a = 7.71 - (-0.213) \times 8}$

$\mathbf{a = 9.414}$

So, the equation is:

$\mathbf{y = a + bx}$

$\mathbf{y = 9.414 - 0.213x}$

Read more about equations of least squares regression at:

brainly.com/question/2141008

8 0

1 year ago

The mean absolute deviation (MAD) for the first set of data is 1.2 and the MAD for the second set of data is 0.6. Approximately

Mekhanik [1.2K]

The answer is 2.0 I promise

3 0

2 years ago

What does < > 5 mean

bonufazy [111]

<5 means less than 5
≤5 means less than or equal to 5
> 5 means greater than 5
≥ 5 means greater than or equal to 5

Hope this helps:)

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2 years ago

True or false: Scientific evidence is a clue that helps answer a question or explain something. I will mark brainiest

ololo11 [35]

Answer:

true

Step-by-step explanation:

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2 years ago

Read 2 more answers

Aldo drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 8 hours. When Aldo drove h

Aneli [31]

8x = 5(x+21)
8x = 5x +105
3x = 105
x = 105 /3
x = 35

8 x 35 = 280 miles away

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2 years ago