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maks197457 [2]
4 years ago
13

A nurse in a large university (N ? 30,000) is concerned about students' eye health. She takes a random sample of 75 students who

don't wear glasses and finds 27 that need glasses.
A. What's the point estimate of p, the population proportion?
B. Is the situation binomial? Also, can the z-distribution be used to calculate a confidence interval for the proportion of students who need glasses but don't wear them? Explain.
C. What's the critical z-value (z*) for a 90% confidence interval for the population proportion?
D. What's the margin of error for a 90% confidence interval for the population proportion?
E. Calculate the 90% confidence interval for the population proportion.
F. Using your graphing calculator, find a 95% confidence interval for the proportion of students who need to wear glasses but don't. (Show all work, functions, and inputs on your calculator too.
G. The nurse wants to be able to estimate, with a 95% confidence interval and a margin of error of 6%, the proportion of students who need to wear glasses but don't. Find the necessary sample size (n) for this estimate.
H. The following school year, the nurse wants to construct the same 95% confidence interval for the proportion of students who need glasses but don't wear them, but she thinks the proportion has changed since last year. Without using the point estimate of the population proportion from the previous year, find the necessary sample size (n) for a 95% confidence interval for the population proportion with a margin of error (m) of 6%.
Mathematics
1 answer:
irakobra [83]4 years ago
6 0

Answer:

[0.875;0.925]

Step-by-step explanation:

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masha68 [24]
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7 0
3 years ago
Simplify 8/-3 ÷ -4/9<br><br> A. -8<br> B. -6<br> C. 6<br> D. 8
geniusboy [140]

Answer:

C. 6

Step-by-step explanation:

to divide by a fraction multiply by the recirpocal of that fraction.

8/3 ÷ 9/4

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4 0
3 years ago
7 2/15+52/3+9 13/15 a. 20 2/3 B.21 10/15 C.21 2/3 D.22 2/3 pls do i will mark brainlessness
Andreyy89

Answer:

101/3 or 33 2/3

Step-by-step explanation:

7 2/15=107/15

9 13/15=138/15

107/15+52/3+138/15

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8 0
3 years ago
Uche pumps gasoline at a rate of 18\,\dfrac{\text{L}}{\text{min}}18 min L ​ 18, start fraction, start text, L, end text, divided
Fiesta28 [93]

Answer:

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Step-by-step explanation:

Given:

Uche pumps gasoline at a rate of 18 L/min.

Now, to find Uche's pumping rate in mL/s.

The rate at which Uche pumps gasoline = 18 L/min.

So, to get the pumping rate in mL/s we use convert L/min to mL/s by using conversion factor:

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18 L/min = 16.6667 × 18 mL/s.

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Therefore, Uche's pumping rate is 300 mL/s.

8 0
3 years ago
What is the Answer to this problem 75x+2=
pashok25 [27]
75x+2=
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75x=-2 now divide 75 both sides

75/75x=-2/75
x=-2/75
4 0
3 years ago
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