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2 years ago

HELPPPPPPPPPPPPPPPPPPPPPPPP

Mathematics

1 answer:

anyanavicka [17]2 years ago

5 0

Answer:

There is no Shape

Step-by-step explanation:

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Dak Prescott sucks period i dare you argue

Alexxx [7]

and btw go easy on his injury cowboys! till i die

Step-by-step explanation: my reasons:

The kind of dreams where you wake up and can’t stop smiling.

The smell before and after it rains.

The sound of rain against a rooftop.

The feeling you get when you’re dancing.

The person (or people) that mean the most to you. Stay alive for them.

Trying out new recipes.

The feeling you get when your favorite song comes on the radio.

Things are going to be okay. maybe not today and maybe tomorrow not but things are eventually going to be ok.

7 0

3 years ago

The U.S. Center for Disease Control reports that the mean life expectancy was 47.6 years for whites born in 1900 and 33.0 years

inn [45]

Answer:

b. The null and alternative hypothesis are:

$H_0: \mu_1-\mu_2=0\\\\H_a:\mu_1-\mu_2\neq 0$

c. Student's t distribution, as it is a two-sample test for the difference between means.

d. Test statistic t = 5.42.

P-value = 0

e. They appear to be significantly different, as the sample data gives strong evidence that the difference is greater than 0.

Step-by-step explanation:

This is a hypothesis test for the difference between populations means.

The claim is that the mean life spans in the county is significantly different for whites and nonwhites.

Then, the null and alternative hypothesis are:

$H_0: \mu_1-\mu_2=0\\\\H_a:\mu_1-\mu_2\neq 0$

The significance level is 0.05.

The sample 1 (white), of size n1=124 has a mean of 45.3 and a standard deviation of 12.7.

The sample 2 (non-white), of size n2=82 has a mean of 34.1 and a standard deviation of 15.6.

The difference between sample means is Md=11.2.

$M_d=M_1-M_2=45.3-34.1=11.2$

The estimated standard error of the difference between means is computed using the formula:

$s_{M_d}=\sqrt{\dfrac{\sigma_1^2}{n_1}+\dfrac{\sigma_2^2}{n_2}}=\sqrt{\dfrac{12.7^2}{124}+\dfrac{15.6^2}{82}}\\\\\\s_{M_d}=\sqrt{1.301+2.968}=\sqrt{4.269}=2.066$

Then, we can calculate the t-statistic as:

$t=\dfrac{M_d-(\mu_1-\mu_2)}{s_{M_d}}=\dfrac{11.2-0}{2.066}=\dfrac{11.2}{2.066}=5.42$

The degrees of freedom for this test are:

df=n_1+n_2-2=124+82-2=204

This test is a two-tailed test, with 204 degrees of freedom and t=5.42, so the P-value for this test is calculated as (using a t-table):

$\text{P-value}=2\cdot P(t>5.42)=0.0000002$

As the P-value (0.0000002) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the mean life spans in the county is significantly different for whites and nonwhites.

4 0

3 years ago

5-2. 1/6= please respondela

Keith_Richards [23]

Answer:

Step-by-step explanation:

3 0

3 years ago

A group of friends wants to go to the amusement park. They have $469.75 to spend on parking and admission. Parking is $10.75, an

attashe74 [19]

Answer:

Step-by-step explanation:

469.75-10.75 =

459 ÷ 38.25 =

8 0

2 years ago

Solve the equation V - E + F = 2 for E

Anettt [7]

V + f − e = 2
Add -2+e to both sides. 

v + f − e -2+e = 2 -2+e 
On simplification, we get 
v + f − 2 = e 

Yes, that is the solution for e.

5 0

3 years ago