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gogolik [260]
2 years ago
6

Please help I don't understand ​

Mathematics
1 answer:
DIA [1.3K]2 years ago
5 0

Answer:

14/18

Step-by-step explanation:

7/9 x 2= 14/18

7/9=14/18

but not sure what proportion means but just look up definition and yeah

I hope this was helpful!

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To Test the ability of auto mechanics to identify simple engine problems, an automobile with a single suchproblem was taken to 7
dedylja [7]

Answer:

z=\frac{0.583 -0.75}{\sqrt{\frac{0.75(1-0.75)}{72}}}=-3.273  

p_v =P(Z  

So the p value obtained was a very low value and using any significance level for example \alpha=0.05 we have p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the proportion of mechanics who worked on the carcorrectly identified the problem is significantly less than 0.75.  

Step-by-step explanation:

1) Data given and notation  

n=72 represent the random sample taken

X=42 represent the mechanics who worked on the carcorrectly identified the problem

\hat p=\frac{42}{72}=0.583 estimated proportion of mechanics who worked on the carcorrectly identified the problem

p_o=0.75 is the value that we want to test

\alpha represent the significance level

z would represent the statistic (variable of interest)

p_v represent the p value (variable of interest)  

2) Concepts and formulas to use  

We need to conduct a hypothesis in order to test the claim that the true proportion is less than 0.75:  

Null hypothesis:p\geq 0.75  

Alternative hypothesis:p < 0.75  

When we conduct a proportion test we need to use the z statistic, and the is given by:  

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

The One-Sample Proportion Test is used to assess whether a population proportion \hat p is significantly different from a hypothesized value p_o.

3) Calculate the statistic  

Since we have all the info requires we can replace in formula (1) like this:  

z=\frac{0.583 -0.75}{\sqrt{\frac{0.75(1-0.75)}{72}}}=-3.273  

4) Statistical decision  

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.  

The next step would be calculate the p value for this test.  

Since is a left tailed test the p value would be:  

p_v =P(Z  

So the p value obtained was a very low value and using any significance level for example \alpha=0.05 we have p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the proportion of mechanics who worked on the carcorrectly identified the problem is significantly less than 0.75.  

7 0
3 years ago
Please help ASAP 30 points
Ugo [173]

the answer is b 18 because you add all three together and dived by 3

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3 years ago
in the next step an arc is drawn from point f which intersects the arc through f in point g. What statement is true for this ste
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Answer:

i don't know you didn't give me any choices

Step-by-step explanation:

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3 years ago
Maya was asked whether the following equation is an identity (2x+3)(x+1) = 2(x+1)^2 + (x+1)
quester [9]
No their not the first one ends up as 2x^2 plus four x plus four the other one isn’t the same
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What is the area of 3.14 x 20
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Step-by-step explanation:

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