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vovangra [49]
3 years ago
11

You wish to find a 95% confidence interval for the mean number of times men change channels with a remote control during a comme

rcial. based on a preliminary study, you estimate σ = 15. how many commercials' worth of data do you need to have a margin of error no more than 3?
Mathematics
1 answer:
gogolik [260]3 years ago
4 0
For margin of error to be a maximum of 3:
3 = z*(SD / sqrt(n)), where z is the z-score, SD is the standard deviation and n is the sample size.
z = 1.96 for a 95% confidence interval, and we are given SD = 15.
3 = 1.96*15/sqrt(n)
sqrt(n) = 9.8
n = 96.04 ~ 96 commercials.

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docker41 [41]

Answer:

(-2,6)

Step-by-step explanation:

The solution to the system of equations should be true for both equations.  This means that if you substitute -2 into both equations, you should get 6 as the y value for both equations.

They gave you a graph, and to find the solution from the graph, you just look at which point is shared by both lines, or at which point both lines intersect.

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5 0
3 years ago
What is seven fourths of fifth
Kruka [31]
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3 0
3 years ago
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inysia [295]

Answer:

x+y

Step-by-step explanation:

Let's pretend the value of the crayon's is 'y'. The value of the markers is 'x'. If we add them together, we get x+y. This is because we do not know the value of each variable.

Hope this helps! Have a nice day <3

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2 years ago
Here someone help me is this correct or no someone reported me saying it was wrong
Neko [114]
-2^{4} = 16

You're right.
8 0
3 years ago
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sasho [114]
A circular concrete slab is a cylinder. Vol = pi%2Ar%5E2%2Ah
in this cylinder:
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h = 3%2F12 = .25 ft
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Find the volume in cu/ft:
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V = 63.61725 cu/ft
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Yan na po
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2 years ago
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