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2 years ago

Please tell me the answer...due today

Mathematics

1 answer:

jekas [21]2 years ago

5 0

Answer:

I think

each division is subtracted like

8 - 4 = 4

so that why it's written as

1/4 ...........

1/8 1/8 ..........

Step-by-step explanation:

if understand I need brainlist

if not then also

thanks

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Question 1 options:Residents in Portland, Oregon think that their city has more rainfall than Seattle, Washington. To test this

dimaraw [331]

Answer:

There is no enough evidence to to support the claim that Portland has more average yearly rainfall than Seattle.

Being μ1: average rainfall in Portland, μ2: average rainfall in Seattle, the null and alternative hypothesis are:

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

P-value = 0.1290

As the P-value is bigger than the significance level, the effect is not significant and the null hypothesis failed to be rejected.

Step-by-step explanation:

We have to test the hypothesis of the difference between means.

The claim is that Portland has more average yearly rainfall than Seattle.

Being μ1: average rainfall in Portland, μ2: average rainfall in Seattle, the null and alternative hypothesis are:

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

The significance level is 0.10.

The sample for Portland, of size n1=45, has a mean of M1=37.50 and standard deviation of s1=1.82.

The sample for Seattle, of size n1=35, has a mean of M1=37.07 and standard deviation of s1=1.68.

The difference between means is:

$M_d= M_1-M_2=37.50-37.07=0.43$

The standard error for the difference between means is:

$s_{M_d}=\sqrt{\dfrac{\sigma_1^2}{n_1}+\dfrac{\sigma_2^2}{n_2}}=\sqrt{\dfrac{1.82^2}{45}+\dfrac{1.68^2}{35}}=\sqrt{ 0.0736+0.0688 }=\sqrt{0.1424}\\\\\\s_{M_d}=0.3774$

We can calculate the t-statistic as:

$t=\dfrac{M_d-(\mu_1-\mu_2)}{s_{M_d}}=\dfrac{0.43-0}{0.3774}=1.1393$

The degrees of freedom are:

$df=n1+n2-2=45+35-2=78$

Then, the p-value for this one-tailed test with 78 degrees of freedom is:

$P-value=P(t>1.1393)=0.1290$

As the P-value is bigger than the significance level, the effect is not significant and the null hypothesis failed to be rejected.

There is no enough evidence to to support the claim that Portland has more average yearly rainfall than Seattle.

7 0

3 years ago

Find the surface area.

OLga [1]

Answer:

972 ?

Step-by-step explanation:

I just multiplied everything, sorry if it's not correct.

4 0

3 years ago

How many 14-1/4" long pieces can be cut from a 86' long piece of angle iron? Allow 1/8 waste for each cut

kkurt [141]

The number of pieces that we could have in 86' if were going to cut it by 14 1/4 long with 1/8 waste for each cut is 5.98 pieces. This is computed by converting first the fractions into decimal, 14.25 and 0.125, then add it together since there is a waste in every cut, 14.375. Then we will divide 86 inches by 14.375 inches.

6 0

3 years ago

When testing for current in a cable with sixsix color-coded wires, the author used a meter to test threethree wires at a time.

Virty [35]

Answer:

20 tests

Step-by-step explanation:

There are six different wires, and for each test the author picks three, this means that each test is a combination of three out of six wires (₆C₃) . The number of total combinations possible is given by:

$_6C_3=\frac{6!}{(6-3)!3!}\\_6C_3=\frac{6*5*4}{3*2*1}\\_6C_3=20$

20 tests are required to verify every possible pairing of three wires.

7 0

4 years ago

15. please 10 points if you help me with this question

anzhelika [568]

No it does not stay the same

Original ratio is 6:5 which means it will only stay the same if the amount of movies to band is taken at multiples of this ratio. per sample if 24 movies are sold then

24/6=4 so you will have to multiply or sell 5*4=20 of the band ones to be able to keep same ratio.

4 0

3 years ago

Please tell me the answer...due today​

Please tell me the answer...due today