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SCORPION-xisa [38]
3 years ago
14

A leading medical journal claims that 68% of high school students experience anxiety just before an exam. A school counselor wan

ts to conduct a survey to verify this with the students in her school and wants to do so with a margin of error (ME) of ±7%. What minimum sample size, rounded to the nearest whole person, does the counselor need to use? Hint: ME equals plus or minus two times square root of start fraction p hat left parenthesis one minus p hat right parenthesis over N end fraction end square root, where p hat is the yes proportion in the sample and N is the sample size.
N ≥ 175
N ≥ 178
N ≥ 200
N ≥ 262
Mathematics
1 answer:
BigorU [14]3 years ago
5 0
The answer is N<span>≥ 178. I just had this question and that was right.</span>
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Mr. Hayden's Bible class collected $11
ki77a [65]

This is the only way I can think of this mathematically. This took a good 20 minutes for me. You need to guess and check. Like try 17 quarters, 50 nickels, and 37 dimes etc. until you get 11.00. My numbers are mathematically correct but we both know you cant have 18.909 quarters so. lol

Answer:

Quarters: 18.909

Nickels: 49.818

Dimes: 37.818

Somewhere around those numbers.

Step-by-step explanation:

$11.00 total in coins

Nickel = $0.05

Dime = $0.10

Quarter = $0.25

(n*0.05) + (d*0.10) + (q*0.25)

Solve the equation for q.

q=\frac{1}{2} d

(n*0.05) + (d*0.10) +( \frac{1}{2} d *0.25)

Simplify the expression.

9d + 2n = 440

d - n = -12

Multiply both sides of the equation by -9.

-9d + 9n = 108

9d + 2n = 440

Sum the equations vertically to eliminate at least one variable.

11n = 548

n=\frac{548}{11}

Substitute the given value of n into the equation d - n = -12

d-\frac{548}{11} =-12

d=\frac{416}{11}

Substitute the given value of n into the equation q=\frac{1}{2} d

q=\frac{1}{2} *\frac{416}{11}

q=\frac{208}{11}

Finally

d=\frac{416}{11}        d = 37.818

n=\frac{548}{11}        n = 49.818

q=\frac{208}{11}        q = 18.909

6 0
2 years ago
Plot the image of point Q under a reflection across the -axis.
Jlenok [28]

Answer:

pit it on -4 because your reflecting it on x

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Help me please and thank you ​
goldenfox [79]
I believe the answer is 78.54 , D
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Read 2 more answers
-4y+8-3x+4y+9+5x= Need help
lord [1]

Answer:

2x+17

Step-by-step explanation:

-4y+8-3x+4y+9+5x

Combine like terms

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2x             +0             +17

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3 years ago
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The butter distributor charges $4.50 per pound, but there is a handling fee of $8.50 per order. Free shipping for orders between
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Answer:

14.00

Step-by-step explanation:

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