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Pachacha [2.7K]
3 years ago
7

yall help meee with this work

Bccc%7D1%262%263%5C%5C4%265%266%5C%5C7%268%269%5Cend%7Barray%7D%5Cright%5D%20%5C%5C%20%5Cint%5Climits%5Ea_b%20%7Bx%7D%20%5C%2C%20dx" id="TexFormula1" title=" x^{2} \geq \lim_{n \to \infty} {ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \\ \int\limits^a_b {x} \, dx" alt=" x^{2} \geq \lim_{n \to \infty} {ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \\ \int\limits^a_b {x} \, dx" align="absmiddle" class="latex-formula">

Mathematics
1 answer:
Andreyy893 years ago
8 0

Answer:

?

Step-by-step explanation:

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Answer:

z=\frac{19.87-20}{\frac{0.4}{\sqrt{25}}}=-1.625    

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Step-by-step explanation:

Information provided

\bar X=19.87 represent the sample mean

\sigma=0.4 represent the population deviation

n=25 sample size  

\mu_o =68 represent the value that we want to test

\alpha=0.01 represent the significance level

z would represent the statistic

p_v represent the p value

Hypothesis to test

We want to test if the true mean is at least 20 ounces, the system of hypothesis would be:  

Null hypothesis:\mu \geq 20  

Alternative hypothesis:\mu < 20  

The statistic is given by:

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

Replacing the info given we got:

z=\frac{19.87-20}{\frac{0.4}{\sqrt{25}}}=-1.625    

The p value for this case would be given by:

p_v =P(z  

Since the p value is higher than the significance level provided we have enough evidence to FAIL to reject the null hypothesis and we can conclude that the true mean is not significantly less than 20 ounces.

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Step-by-step explanation:

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