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liberstina [14]
3 years ago
12

Sales of a new line of athletic footwear are crucial to the success of a company. The company wishes to estimate the average wee

kly sales of the new footwear to within $200 with 95% reliability. The initial sales indicate that the standard deviation of the weekly sales figures is approximately $1400. How many weeks of data must be sampled for the company to get the information it desires
Mathematics
1 answer:
MariettaO [177]3 years ago
6 0

Answer:

188 weeks of data must be sampled.

Step-by-step explanation:

From the information given, we can deduce that:

The Margin of error is within = 200

The confidence interval = 95%

The level of significance = 1 - C.I

= 1 - 0.95

= 0.05

The standard deviation = 1400

The number of weeks the data must be sampled can be determined by using the formula for sample size which is:

n =( \dfrac{Z_{\alpha/2} \times \sigma}{E} )^2

n =( \dfrac{Z_{0.05/2} \times 1400}{200} )^2

n =( \dfrac{1.96 \times 1400}{200} )^2

n =( \dfrac{2744}{200} )^2

n =( 13.72)^2

n = 188.24

n ≅ 188

Thus, 188 weeks of data must be sampled.

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ki77a [65]

Answers:

What is the ratio?         120:2

What is the unit rate?   60:1

What is the rate?          60 jumping jacks per minute

===================================================

Further Explanation:

To find the ratio of jumping jacks to minutes, you just write the two values 120 and 2 separated by a colon. That's how we get 120:2 as our first answer.

--------

Once we have 120:2, we divide both parts by 2 to get 60:1

120/2 = 60

2/2 = 1

The reason why we do this is so that the "2 minutes" turns into "1 minute". A unit ratio has the time value in unit increments so we can see how many jumping jacks Samuel can do. Writing "60:1" means "60 jumping jacks in 1 minute"

-------

Saying "60 jumping jacks in 1 minute" is the same as saying "60 jumping jacks per minute", which is similar to a car's speed of something like 60 miles per hour. The unit "X per Y" is the template for speed, where X is the number of items you get done and Y is the unit of time. In this case, X = 60 jumping jacks and Y = 1 minute.

4 0
3 years ago
Read 2 more answers
Help immediately please
Debora [2.8K]

Answer:

35,45,55 is not a triangle

Step-by-step explanation:

The three angles of a triangle add to 180

30+60+90 = 180  

true

45+55+80 = 180

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30+45+105 =180

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4 years ago
GEOMETRY- What is the area of the figure, show your work please!
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Since this is a 45-45-90 right triangle, the hypotenuse = sqrt2 * leg
24 is the hypotenuse so we need to find the leg.
24 = sqrt2 * leg
Divide both sides by sqrt2
leg = 16.97
A = (1/2)b*h
A = (1/2)*16.97*16.97
A = 144ft^2
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Noah is working on a geometry problem that involves finding the volume of a sphere with a diameter of 9 units. His work is shown
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No, Noah used the diameter instead of the radius in the calculations is the answer. 
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3 years ago
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4/5 of a number r is equal to 16.
amm1812

Answer:

r=20

Step-by-step explanation:

take the number you have, divide it by the numerator, and multiply it by the denominator, like shown:

4/5 of a number (r) is 16

16/4=4

4*5=20

r=20

ta-da! :P

7 0
3 years ago
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