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MAXImum [283]
2 years ago
9

In order to estimate the mean amount of time computer users spend on the internet each​ month, how many computer users must be s

urveyed in order to be 9595​% confident that your sample mean is within 1010 minutes of the population​ mean? Assume that the standard deviation of the population of monthly time spent on the internet is 221221 min. What is a major obstacle to getting a good estimate of the population​ mean? Use technology to find the estimated minimum required sample size.
Mathematics
1 answer:
levacccp [35]2 years ago
7 0

Answer:

1877 computer users

Step-by-step explanation:

We have that for 95% of confident, the value of z has a value of 1.96 (attached table about it), they also mention the margin of error (E) that is 10 and finally the standard deviation (sd) that has a value of 221.

We apply the following formula:

n = [z * sd / E] ^ 2

replacing:

n = [1.96 * 221/10] ^ 2

n = 1876.27

that is, the minimum sample size is 1877

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3 years ago
Helloooo please give the right answer :)
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Step-by-step explanation:

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2 years ago
PLZ HELP ASAP SIMMILAR AND CONGRUENT TRIANGLES
Dvinal [7]
LA=3.5; AY=7
LW=?

LW=LA+AW
AW=?

Let's analyze triangles LAY and YAW
1) Triangle LAY
Angle LAY is 90°
Suppose Angle ALY is x
The angle LYA is the complement of x, for example y:
x+y=90°→y=90°-x

2) Triangle YAW
Angle AYW is the complement of angle LAY (y), then the angle AYW must be equal to x.
Angle YAW is 90°, because the angle LAY is 90°

The triangles LAY and YAW are similars, because they have to congruent angles:
Angle LAY = 90° = Angle YAW
Angle ALY = x = Angle AYW
Then the sides of triangles LAY and YAW must be proportionals:
AW/AY=AY/LA
Replacing the known values:
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AW/7=2
Solving for AW. Multiplying both sides of the equation by 7:
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Now:
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Answer: LW=17.5 units

  
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2 years ago
18. The yearly attendance at a local restaurant is 54,200 and grows continuously at a rate of 7.2% each year. What is the approx
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Answer:

Step-by-step explanation:

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