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statuscvo [17]
3 years ago
6

Can someone help me with this please???

Mathematics
1 answer:
DIA [1.3K]3 years ago
7 0

Answer:

148

Step-by-step explanation:

148

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The valve was tested on 270 engines and the mean pressure was 6.6 lbs/square inch. Assume the variance is known to be 0.49. If t
BlackZzzverrR [31]

Answer:

z=\frac{6.6-6.5}{\frac{0.7}{\sqrt{270}}}=2.347      

The p value for this case would be given by"

p_v =2*P(z>2.347)=0.0189  

For this case since the p value is higher than the significance level we don't have enough evidence to conclude that the true mean is significantly different from 6.5 lbs/square inch at 10% of significance. So then there is not enough evidence to conclude that the valve does not perform to the specifications

Step-by-step explanation:

Information given

\bar X=6.6 represent the sample mean

s=\sqrt{0.49}= 0.7 represent the population deviation

n=270 sample size      

\mu_o =6.5 represent the value that we want to test    

\alpha=0.1 represent the significance level

z would represent the statistic

p_v represent the p value for the test

Hypothesis to verify

We want to verify if the true mean for this case is equal to 6.5 lbs/square inch or not , the system of hypothesis would be:      

Null hypothesis:\mu= 6.5      

Alternative hypothesis:\mu \neq 6.5      

The statistic for this case is given by:

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}} (1)      

And replacing we got:

z=\frac{6.6-6.5}{\frac{0.7}{\sqrt{270}}}=2.347      

The p value for this case would be given by"

p_v =2*P(z>2.347)=0.0189  

For this case since the p value is higher than the significance level we don't have enough evidence to conclude that the true mean is significantly different from 6.5 lbs/square inch at 10% of significance. So then there is not enough evidence to conclude that the valve does not perform to the specifications

8 0
4 years ago
Circle the numbers that would make a square array
Artemon [7]

Hello from MrBillDoesMath!

Answer:   1, 4, 9. 16, 25, 36

Discussion:

If by "square array" you mean an array of perfect squares, the answer is


1, 4, 9. 16, 25, 36



Thank you,

MrB

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Brianna has 4 pink bracelets . One third of all her bracelets are pink. How many bracelets does Brianna have?
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4/x=1/3 Cross multiply.
X=12 12 bracelets.
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I'll give brainliest to whoever answers the question correctly!!
yulyashka [42]

Answer:

C

Step-by-step explanation:

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Answer:

GVTGSYHUAJN

Step-by-step explanation:

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