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torisob [31]
3 years ago
11

If the area of the cube is 2 1/2 what is the surfece area

Mathematics
1 answer:
mariarad [96]3 years ago
6 0

Answer:

37.5

Step-by-step explanation:

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The sales of a grocery store had an average of $8,000 per day. The store introduced several advertising campaigns in order to in
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Step-by-step explanation:

1) Data given and notation  

\bar X=8300 represent the sample mean  

\sigma=1200 represent the population standard deviation  

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Null hypothesis:\mu \leq 8000  

Alternative hypothesis:\mu > 8000  

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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".  

3) Calculate the statistic  

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

z=\frac{8300-8000}{\frac{1200}{\sqrt{64}}}=2  

4) P-value  

Since is a one-side upper test the p value would given by:  

p_v =P(Z>2)=0.0228  

5) Conclusion  

If we compare the p value and the significance level assumed, for example \alpha=0.05 we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, so we can conclude that the mean is significantly higher than $8000.  

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