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Luden [163]
3 years ago
14

PLEASE HELPPPPPPPPPP

Mathematics
2 answers:
Butoxors [25]3 years ago
8 0

Answer:

surface area = 92

volume = 48

Step-by-step explanation:

Alenkasestr [34]3 years ago
7 0

Answer:

Volume=48cm³ Surface Area= 92 cm

Step-by-step explanation:

For volume do 8x2x3

For surface area, find are of each face, so 6+6+24+24+16+16= 92

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Josh and his brother will drive from Boston to New York, a distance of 220 miles. If they drive an average speed of 55 miles per
Levart [38]

Answer:

4 hours

Step-by-step explanation:

just do 220 miles divided by 55 miles which equals 4.

220/55

4 0
3 years ago
A 63-square-foot roll of plastic wrap costs $1.89. A 9-square-yard roll costs $2.43. Which roll is a better deal?
skad [1K]

Answer:

the 63 square-foot roll 3cents for each square foot

Step-by-step explanation:

5 0
3 years ago
Alice is riding a Ferris Wheel. When does she have the most potential energy?
Sati [7]

Answer:

I say A

Step-by-step explanation:

because it is the highest point.

3 0
3 years ago
What is this number written in standard form 3×1,000,00+3×100,00+2×100
pav-90 [236]
3(1,000,000)=3,000,000
3(100,000)=300,000
2(100)=200
3,300,200
6 0
3 years ago
Read 2 more answers
A doctor released the results of clinical trials for a vaccine to prevent a particular disease. In these clinical​ trials, 200,0
CaHeK987 [17]

Answer:

1) No, there is  not  enough evidence to support the claim that the vaccine was effective (P-value=0.104) .

The null and alternative hypothesis are:

H_0: \pi_1-\pi_2=0\\\\H_a:\pi_1-\pi_2< 0

being the subindex 1 for the experimental group and subindex 2 for the control group.

2) Test statistic z=-1.26

Step-by-step explanation:

This is a hypothesis test for the difference between proportions.

The claim is that the vaccine was effective.

Then, the null and alternative hypothesis are:

H_0: \pi_1-\pi_2=0\\\\H_a:\pi_1-\pi_2< 0

The significance level is 0.01.

The sample 1 (experimental group), of size n1=100000 has a proportion of p1=0.0002.

p_1=X_1/n_1=21/100000=0.0002

The sample 2 (control group), of size n2=100000 has a proportion of p2=0.0003.

p_2=X_2/n_2=30/100000=0.0003

The difference between proportions is (p1-p2)=-0.0001.

p_d=p_1-p_2=0.0002-0.0003=-0.0001

The pooled proportion, needed to calculate the standard error, is:

p=\dfrac{X_1+X_2}{n_1+n_2}=\dfrac{21+30}{100000+100000}=\dfrac{51}{200000}=0.00026

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

s_{p1-p2}=\sqrt{\dfrac{p(1-p)}{n_1}+\dfrac{p(1-p)}{n_2}}=\sqrt{\dfrac{0.00026*0.99974}{100000}+\dfrac{0.00026*0.99974}{100000}}\\\\\\s_{p1-p2}=\sqrt{0+0.0000000025}=\sqrt{0.0000000051}=0.000071

Then, we can calculate the z-statistic as:

z=\dfrac{p_d-(\pi_1-\pi_2)}{s_{p1-p2}}=\dfrac{-0.00009-0}{0.000071}=\dfrac{-0.00009}{0.000071}=-1.26

This test is a left-tailed test, so the P-value for this test is calculated as (using a z-table):

P-value=P(z

As the P-value (0.104) is bigger than the significance level (0.01), the effect is not significant.

The null hypothesis failed to be rejected.

There is  not  enough evidence to support the claim that the vaccine was effective.

6 0
3 years ago
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