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Alchen [17]
3 years ago
7

An article in the ASCE Journal of Energy Engineering describes a study of the thermal inertial properties of autoclaved aerated

concrete used as a building material. Five samples of the material were tested in a structure, and the five temperatures (◦C) reported were: 23.01, 22.22, 22.04, 22.62, and 22.59
Test the hypothesis of H0 : µ = 22.5 versus H1 : µ 6= 22.5.

Show and label the 5 steps.
Mathematics
1 answer:
Zanzabum3 years ago
5 0

Answer:

Null hypothesis:\mu = 22.5  

Alternative hypothesis:\mu \neq 22.5  

t=\frac{22.496-22.5}{\frac{0.378}{\sqrt{5}}}=-0.0236    

p_v =2*P(t_{(4)}  

If we compare the p value and the significance level given assumed for example \alpha=0.05 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, so we can conclude that the population mean is NOT significant different from 22.5 at 5% of significance.  

Step-by-step explanation:

Previous concepts  and data given

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

First we can calculate the average and the sample standard deviation with the following formulas:

\bar X = \frac{\sum_{i=1}^n x_i}{n}

s= \sqrt{\frac{\sum_{i=1}^n (x_i -\bar X)^2}{n-1}}

\bar X=22.496 represent the sample mean  

s=0.378 represent the sample standard deviation

n=5 represent the sample selected

\alpha significance level  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the mean is equal to 22.5, the system of hypothesis would be:  

Null hypothesis:\mu = 22.5  

Alternative hypothesis:\mu \neq 22.5  

If we analyze the size for the sample is < 30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

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

t-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:  

t=\frac{22.496-22.5}{\frac{0.378}{\sqrt{5}}}=-0.0236    

P-value

The first step is calculate the degrees of freedom, on this case:  

df=n-1=5-1=4  

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

p_v =2*P(t_{(4)}  

Conclusion  

If we compare the p value and the significance level given assumed for example \alpha=0.05 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, so we can conclude that the population mean is NOT significant different from 22.5 at 5% of significance.  

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The average cost of tuition plus room and board at small private liberal arts colleges is reported to be less than $18,500 per t
lys-0071 [83]

Answer:

The null and alternative hypothesis for this study are:

H_0: \mu=18500\\\\H_a:\mu< 18500

The null hypothesis is rejected (P-value=0.004).

There is enough evidence to support the claim that the average cost of tuition plus room and board at small private liberal arts colleges is  less than $18,500 per term.

Step-by-step explanation:

This is a hypothesis test for the population mean.

The claim is that the average cost of tuition plus room and board at small private liberal arts colleges is  less than $18,500 per term.

Then, the null and alternative hypothesis are:

H_0: \mu=18500\\\\H_a:\mu< 18500

The significance level is 0.05.

The sample has a size n=150.

The sample mean is M=18200.

The standard deviation of the population is known and has a value of σ=1400.

We can calculate the standard error as:

\sigma_M=\dfrac{\sigma}{\sqrt{n}}=\dfrac{1400}{\sqrt{150}}=114.31

Then, we can calculate the z-statistic as:

z=\dfrac{M-\mu}{\sigma_M}=\dfrac{18200-18500}{114.31}=\dfrac{-300}{114.31}=-2.624

This test is a left-tailed test, so the P-value for this test is calculated as:

P-value=P(z

As the P-value (0.004) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the average cost of tuition plus room and board at small private liberal arts colleges is  less than $18,500 per term.

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marusya05 [52]

Answer:

If you are finding the equation using two points then the answer is

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If this does not help, just ignore honestly.

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Step-by-step explanation:

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