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Vinil7 [7]
3 years ago
6

27 bags is not the answer

Mathematics
2 answers:
zavuch27 [327]3 years ago
6 0

Answer:

26

6 1/2 divided by 1/4 is 26

Alinara [238K]3 years ago
4 0

Answer:

It's 27 bags your teacher just dum

Step-by-step explanation:

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A marketing researcher wants to find a 96% confidence interval for the mean amount those visitors spend per person per day while
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Answer:

n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38

So then the minimum sample to ensure the condition given is n= 38

Step-by-step explanation:

Notation

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

\sigma=12 represent the population standard deviation

n represent the sample size  

ME = 4 the margin of error desired

Solution to the problem

When we create a confidence interval for the mean the margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =4 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

The critical value for 96% of confidence interval now can be founded using the normal distribution. The significance is \alpha=1-0.96 =0.04. And in excel we can use this formula to find it:"=-NORM.INV(0.02;0;1)", and we got z_{\alpha/2}=2.054, replacing into formula (b) we got:

n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38

So then the minimum sample to ensure the condition given is n= 38

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There are four classes of third graders at Woodbury Elementary School. One class has 24 students, one has 26 students, another h
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