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PSYCHO15rus [73]
4 years ago
15

The wholesale price for a shirt is $6.50. A certain department store marks up the wholesale price by 60% . Find the price of the

shirt in the department store. Round your answer to the nearest cent, as necessary.
Mathematics
1 answer:
statuscvo [17]4 years ago
5 0
3.90 I’m not really sure though
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Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population
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Answer:

We have been given confidence interval 95%, mean 20 , data set 30 and standard deviation 3.

We will use the formula: mean\pm \frac{\sigma}{\sqrt{n}}\cdot (z-score)

Here,mean=20,\sigma=3,n=30,z-score=1.96

Z-score value at 95% confidence interval is 1.96

On substituting the values in the formula to plug the values:

20\pm\frac{3}{\sqrt{30}}\cdot (1.96)

Now, we have a formula for marginal error:z\cdot \frac{\sigma}{\sqrt{n}}

Marginal error means your answer will be within that percentage only.

Say you have 3% marginal means your value will be within 3% real population 95% of the time.

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