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vaieri [72.5K]
3 years ago
7

Find x, y, z please help!

Mathematics
1 answer:
ki77a [65]3 years ago
6 0

Answer:

x is 1 y is 1 and a is 1 hope this helped

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8.27 as a mixed number
shepuryov [24]
It is 8/27 is ur answer. Hope this helps!
3 0
3 years ago
Read 2 more answers
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
State when the following equations and inequalities will be true and when they will be false 38= 9k
Step2247 [10]
The equation 38 = 9k will be true when k equals 38/9. (Do 38 divided by 9 to get k, k equals 38/9, which can't be simplified any more.)
3 0
3 years ago
Which equation shows y=3x−15 in standard form? 5x−15y=−1 5x−15y=1 15x+5y=−1 15x−5y=1
Alja [10]

Answer:

3x-y=15 should be the answer

3 0
3 years ago
Robert read 20 pages out of a 300 page book. What percent has he read ? What percent does he still have to read ?
Setler [38]

Answer: he has read 15% and still needs to read 85%

Step-by-step explanation: 300/20 is 15 so that’s the percent he has read. 100-15=85 so that’s the percent he still has left to read

6 0
3 years ago
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