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3 years ago

I am dumb,plz zend help.

Mathematics

2 answers:

dybincka [34]3 years ago

4 0

I think that it is 9 because 14-10=4 so 3+2+4=9 I’m not that sure tho let me know if I’m wrong

taurus [48]3 years ago

3 0

Answer:

<em>Sample response: </em>

k = 7 proves the equations are equivalent and, therefore, have infinitely many solutions. That is illustrated by the fact that multiplying 2 by 3x +2y = 7 will create the equivalent of 6x + 4y =14.

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The Salk polio vaccine experiment in 1954 focused on the effectiveness of the vaccine in combating paralytic polio. Because it w

sdas [7]

Answer:

Step-by-step explanation:

Hello!

The variables of interest are:

X₁: Number of cases of polio observed in kids that received the placebo vaccine.

n₁= 201299 total children studied

x₁= 110 cases observed

X₂: Number of cases of polio observed in kids that received the experimental vaccine.

n₂= 200745 total children studied

x₂= 33 cases observed

These two variables have a binomial distribution. The parameters of interest, the ones to compare, are the population proportions: p₁ vs p₂

You have to test if the population proportions of children who contracted polio in both groups are different: p₂ ≠ p₁

H₀: p₂ = p₁

H₁: p₂ ≠ p₁

α: 0.05

$Z= \frac{(p'_2-p'_1)-(p_2-p_1)}{\sqrt{p'[\frac{1}{n_1} +\frac{1}{n_2} ]} }$

Sample proportion placebo p'₁= x₁/n₁= 110/201299= 0.0005

Sample proportion vaccine p'₂= x₂/n₂= 33/200745= 0.0002

Pooled sample proportion p'= (x₁+x₂)/(n₁+n₂)= (110+33)/(201299+200745)= 0.0004

$Z_{H_0}= \frac{(0.0002-0.0005)-0}{\sqrt{0.0004[\frac{1}{201299} +\frac{1}{200745} ]} }= -4.76$

This test is two-tailed, using the critical value approach, you have to determine two critical values:

$Z_{\alpha/2}= Z_{0.025}= -1.96$

$Z_{1-\alpha /2}= Z_{0.975}= 1.96$

Then if $Z_{H_0}$ ≤ -1.96 or if $Z_{H_0}$ ≥ 1.96, the decision is to reject the null hypothesis.

If -1.96 < $Z_{H_0}$ < 1.96, the decision is to not reject the null hypothesis.

⇒ $Z_{H_0}$ = -4.76, the decision is to reject the null hypothesis.

H₀: p₂ = p₁

H₁: p₂ ≠ p₁

α: 0.01

$Z= \frac{(p'_2-p'_1)-(p_2-p_1)}{\sqrt{p'[\frac{1}{n_1} +\frac{1}{n_2} ]} }$

The value of $Z_{H_0}$ = -4.76 doesn't change, since we are working with the same samples.

The only thing that changes alongside with the level of significance is the rejection region:

$Z_{\alpha /2}= Z_{0.005}= -2.576$

$Z_{1-\alpha /2}= Z_{0.995}= 2.576$

Then if $Z_{H_0}$ ≤ -2.576or if $Z_{H_0}$ ≥ 2.576, the decision is to reject the null hypothesis.

If -2.576< $Z_{H_0}$ < 2.576, the decision is to not reject the null hypothesis.

⇒ $Z_{H_0}$ = -4.76, the decision is to reject the null hypothesis.

Remember the level of significance (probability of committing type I error) is the probability of rejecting a true null hypothesis. This means that the smaller this value is, the fewer chances you have of discarding the true null hypothesis. But as you know, you cannot just reduce this value to zero because, the smaller α is, the bigger β (probability of committing type II error) becomes.

Rejecting the null hypothesis using different values of α means that there is a high chance that you reached a correct decision (rejecting a false null hypothesis)

I hope this helps!

8 0

4 years ago

Can someone plz help me?

Mrac [35]

Answer:

C 6 loaves with flour left over

Step-by-step explanation:

Take the amount of flour and divide by the amount of flour per loaf

9/2 ÷ 2/3

Copy dot flip

9/2 * 3/2

27/4

Change to a mixed number

4 goes into 27 6 times with 3 left over

6 3/4

6 0

3 years ago

Read 2 more answers

The graph shown represents the water level in Kayla’s bathtub as a function of time:

katrin [286]

Kayla soaked in the bathtub.

<u>Step-by-step explanation</u>:

This diagram is included 5 direct segments. The slope of each portion is the rate at which the level of water in the tub is changing. A rising line says that the water level is rising.

A falling line says that the water level is falling. If the water level isn't changing, at that point the slant of the line is zero ... it's a horizontal section.

Before we even glance at the story, we should take a look at the chart:

Portion A: the tub is vacant at time zero, at that point rises gradually for around 8 minutes;

Portion B: out of nowhere at 8 minutes, the level ascents by half

(from level 20 to level 30) in a short time or less;

Portion C: for the following 15 minutes, the level doesn't change;

Portion D: the water drops rapidly to level-20 out of 2 minutes or less;

Portion E: in around 8 minutes, the water level drops gradually to zero.

On the off chance that someone disclosed to us, this was the diagram of a young lady washing up,

we could pretty much peruse the story from the diagram:

A: filling the tub from the faucets ... takes 8 minutes;

B: the individual gradually and cautiously getting into the tub, making the level ascent

C: the individual in the tub;

D: the individual gradually and cautiously escaping the tub;

E: the tub exhausting in a short time.

Presently I'm prepared to take a gander at the decisions.

OK. I see that the inquiry is just posing about fragment C.

K ran water to fill the tub ... No. The level isn't evolving.

K exhausted the tub ... No. The level isn't evolving.

K got into the tub ... No. The level isn't evolving.

K soaked the bath ... Yes! The level isn't evolving.

8 0

4 years ago

Please help! I’ll make brainliest!

jeka94

Answer:

2nd choice

Step-by-step explanation:

csc is 1/sin

cos x 1/sin will give you cos/sin, which is cot.

3 0

3 years ago

Read 2 more answers

HEEEEELPPPPPPPPPPPP ASAP

Ray Of Light [21]

Answer is A 15$=1 hour
30$=2 hours
45$=3 hours and so on

8 0

3 years ago