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tiny-mole [99]
3 years ago
11

Suppose that 200 students are randomly selected from a local college campus to investigate the use of cell phones in classrooms.

When asked if they are allowed to use cell phones in at least one of their classes, 40% of students responded yes. Using these results, with 95% confidence, the margin of error is 0.068. How would the margin of error change if the sample size increased from 200 to 400 students?
Mathematics
1 answer:
serious [3.7K]3 years ago
6 0

Answer:

It would change to 0.04802

Step-by-step explanation:

from this question we have that n became 400

40% of 400

= 160

p* = 160/400

= 0.4

1 - p* =

= 1 - 0.4

= 0.6

at confidence level,

1 - 0.95

= 0.05

alpha/2 = 0.025

z= 1.96

<u>margin of error. E</u>

= 1.96 x √[(0.4 x 0.6)/400]

= 1.96 x 0.0245

= 0.04802

M.E = 0.04802

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Consider the system of equations, y = f(x) and y= g(x), where
NARA [144]

Answer:

  (x, y) = (3, 26)

Step-by-step explanation:

I like to solve systems of equations like this by graphing. A graphing calculator easily shows the solution for both x and y.

  (x, y) = (3, 26)

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As an alternative, here, the equations can be subtracted.

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8 0
3 years ago
+
viva [34]

Answer:

(x - 1) (x + 2) (x + 4)

Step-by-step explanation:

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Answer: (x - 1) (x + 2) (x + 4)

6 0
4 years ago
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Answer:

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Step-by-step explanation:

5 0
3 years ago
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Answer:

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Okay

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