Hello, i need help with this question

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 7.5 parts

DochEvi [55]

Answer:

We accept H₀ with the information we have, we can say level of ozone is under the major limit

Step-by-step explanation:

Normal Distribution

population mean = μ₀ = 7.5 ppm

Sample size n = 16 df = n - 1 df = 15

Sample mean = μ = 7.8 ppm

Sample standard deviation = s = 0.8

We want to find out if ozono level, is above normal level that is bigger than 7.5

1.- Hypothesis Test

null hypothesis H₀ μ₀ = 7.5

alternative hypothesis Hₐ μ₀ > 7.5

2.-Significance level α = 0.01 we will develop one tail-test (right)

then for df = 15 and α = 0,01 from t -student table we get

t(c) = 2.624

3.-Compute t(s)

t(s) = ( μ - μ₀ ) / s /√n ⇒ t(s) = ( 7.8 - 7.5 )*4/0.8

t(s) = 0.3*4/0.8

t(s) = 1.5

4.-Compare t(s) and t(c)

t(s) < t(c) 1.5 < 2.64

Then t(s) is inside the acceptance region. We accept H₀

7 0

3 years ago

At Clucker's Chicken, a bucket of 4 pieces of dark meat and 5 pieces of white meat costs 7.05. A bucket of 3 pieces of dark meat

Alenkinab [10]

Answer:

The cost of a piece of dark meat is $0.70 and the cost of a piece of white meat is $0.85.

Step-by-step explanation:

Given:

At Clucker's Chicken, a bucket of 4 pieces of dark meat and 5 pieces of white meat costs 7.05.

A bucket of 3 pieces of dark meat and 8 pieces of white meat costs 8.90.

Now, to find the cost of a piece of dark meat and the cost of a piece of white meat.

Let the cost of a piece of dark meat be $x.$

And the cost of a piece of white meat be $y.$

A bucket of 4 pieces of dark meat and 5 pieces of white meat costs $7.05.

So,

$4x+5y=7.05$

$4x=7.05-5y$

$x=\frac{7.05-5y}{4}$ .......(1)

Now, a bucket of 3 pieces of dark meat and 8 pieces of white meat costs $8.90.

$3x+8y=8.90$

Substituting the value of $x$ from equation (1) we get:

$3(\frac{7.05-5y}{4})+8y=8.90$

$\frac{21.15-15y}{4} +8y=8.90$

$\frac{21.15-15y+32y}{4} =8.90$

Multiplying both sides by 4 we get:

$21.15-15y+32y=35.60$

$21.15+17y=35.60$

Subtracting both sides by 21.15 we get:

$17y=14.45$

Dividing both sides by 17 we get:

$y=0.85$

The cost of a piece of white meat = $0.85.

Now, substituting the value of $y$ in equation (1) we get:

$x=\frac{7.05-5y}{4}$

$x=\frac{7.05-5\times 0.85}{4}$

$x=\frac{7.05-4.25}{4}$

$x=\frac{2.8}{4}$

$x=0.70.$

The cost of a piece of dark meat = $0.70.

Therefore, the cost of a piece of dark meat is $0.70 and the cost of a piece of white meat is $0.85.

5 0

3 years ago

How many terms are in this expression? 4x + 3y - 12x + 5

Vladimir79 [104]

There are 4 terms in the expression.

Terms are each of the entities.

4x, + 3y , -12x, +5

5 0

3 years ago

What is the product in simplest form? −6/11 ⋅ 3/4

disa [49]

−6/11 ⋅ 3/4
= -3/11 ⋅ 3/2
= -9/22

hope it helps

6 0

3 years ago

Read 2 more answers

PORS and XYZ are straight lines.

natta225 [31]

I have no idea

Step-by-step explanationI have no idea

6 0

3 years ago