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rusak2 [61]
2 years ago
15

. What is our rule about how heat is transferred?

Mathematics
1 answer:
V125BC [204]2 years ago
4 0

Answer:

hope this helps

Step-by-step explanation:

Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass. The method used to transfer heat is usually the one that is the most efficient.

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A manufacturing company produces valves in various sizes and shapes. One particular valve plate is supposed to have a tensile st
maxonik [38]

Answer:

z=\frac{5.0611-5}{\frac{0.2803}{\sqrt{42}}}=1.413    

p_v =2*P(z>1.413)=0.158  

If we compare the p value and the significance level given \alpha=0.1 we see that p_v>\alpha so we can conclude that we have enough evidence to fail reject the null hypothesis, so we can't conclude that the average tensile strength is different from 5lbs/mm at 10% of signficance

Step-by-step explanation:

Data given and notation  

\bar X=5.0611 represent the sample mean

\sigma=0.2803 represent the population standard deviation for the sample  

n=42 sample size  

\mu_o =5 represent the value that we want to test

\alpha=0.1 represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the true mean is different from 5, the system of hypothesis would be:  

Null hypothesis:\mu = 5  

Alternative hypothesis:\mu \neq 5  

If we analyze the size for the sample is > 30 but and we know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}  (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic

We can replace in formula (1) the info given like this:  

z=\frac{5.0611-5}{\frac{0.2803}{\sqrt{42}}}=1.413    

P-value

Since is a two sided test the p value would be:  

p_v =2*P(z>1.413)=0.158  

Conclusion  

If we compare the p value and the significance level given \alpha=0.1 we see that p_v>\alpha so we can conclude that we have enough evidence to fail reject the null hypothesis, so we can't conclude that the average tensile strength is different from 5lbs/mm at 10% of signficance

8 0
3 years ago
HELP ASAP!!!!!!!!!! Please
N76 [4]

Answer:

C

Step-by-step explanation:

Growth can be represented by the equation A=A_01.02^{t}. We know that r=2% or 0.02 in this situation so we have 1.02. We know t=100 hours and the starting population A=200. We substitute these values and use a calculator to evaluate.

A=A_01.02^{t}\\A=200(1.02)^{100}

We now use our calculator to evaluate the exponent first and then multiply by 200.

A=200(7.2446)=1448.93


8 0
3 years ago
Y=3x- 15 ordered pair
astraxan [27]
Three ordered pairs would be
x   y
0, -15
1, -12
2, -9
ect... 
5 0
2 years ago
I need helppp!!!!!!!
Marina86 [1]

i dont get that either lol pain. why does school have to be so hard

7 0
2 years ago
Read 2 more answers
A fork costs £8.95 . Jay buys seven forks . How much does he spend?​
tensa zangetsu [6.8K]

Answer:

£62.65

Step-by-step explanation:

Multiply by seven

8 0
3 years ago
Read 2 more answers
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