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Ira Lisetskai [31]
3 years ago
7

A store owner is interested in opening a second shop. She wants to estimate the true average daily revenue of her current shop t

o decide whether expanding her business is a good idea. The store owner takes a random sample of 60 days over a six-month period and finds that the mean revenue of those days is 3,472.00 dollars with variance 315,900.20 square dollars. Calculate a 95% confidence interval to estimate the true average daily revenue.
Mathematics
1 answer:
Alex3 years ago
6 0
Every confidence interval has associated z value. As confidence interval increases so do the z value associated with it. 
The confidence interval can be calculated using following formula:
\overline{x} \pm \frac{zs}{\sqrt n}
Where \overline{x} is the mean value, z is the associated z value, s is the standard deviation and n is the number of samples.
We know that standard deviation is simply a square root of variance:
s=\sqrt{315900.20}=\$562.05
The confidence interval of 95% has associated z value of <span>1.960.
</span>Now we can calculate the confidence interval for our income:
3472.00\pm \frac{1.960\cdot 562.05}{\sqrt{60}}\\ \$3472.00\pm142.22


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Answer: 59.92

Step-by-step explanation:

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3 years ago
I NEED HELPPP WITH THISSS
goblinko [34]

Answer:

\boxed{\boxed{\sf (-20) }}

given - X = (-8).

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To find - Value of this equation

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3 0
2 years ago
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german
2×5^{2} if you don't understand its 2 times 5 to the second power.
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3 years ago
What is the slope of the line that passes through (-3,-7) and (1,9)
Rus_ich [418]

To find slope, use the formula:

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So here is what it will look like:

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(9+7)/1+3)

16/4

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4 0
3 years ago
6. Find the missing value. Show your work.
VLD [36.1K]
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sin A = opp/hyp

sin 51 deg = y/12

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