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Pavel [41]
4 years ago
7

Using the Formula n=1/(ME)2 to Determine Sample Size When we want confidence and use the conservative estimate of , we can use t

he simple formula to roughly determine the sample size needed for a given margin of error . Use this formula to determine the sample size needed for a margin of error of 0.005 . Enter the exact answer.
Mathematics
1 answer:
PIT_PIT [208]4 years ago
4 0

Answer:

The sample size needed is 40000.

Step-by-step explanation:

The sample size needed is:

n = \frac{1}{M^{2}}

Use this formula to determine the sample size needed for a margin of error of 0.005

This is n when M = 0.005. So

n = \frac{1}{M^{2}}

n = \frac{1}{0.005^{2}}

n = 40000

The sample size needed is 40000.

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7n^2+16n+15=2n^2+3 solve using Quadratic
Harrizon [31]

Answer:

n=6/5 or n=-2

Step-by-step explanation:

7n^2+16n+15=2n^2+3

collect like terms

7n^2-2n^2 +16n=3-15

5n^2 + 16n= -12

5n^2 +16n + 12

(5n^2+10n)+(6n+12)

5n(n+2)+6(n+2)

(5n+6)(n+2)

n=6/5 or n=-2

3 0
3 years ago
Handedness: 18 left-handed
guapka [62]

Answer:

Let x be the number of left handed female students and let y be the number of left handed male students.

Then the number of right handed female students will be 5x and the number of right handed male students will be 9y. Since the total number of left handed students is 18 and the total number of right handed students is 122, the following system of equations must be satisfied.

x+y=18 and 5x+9y=122

Solving this system gives x=10 and y=8.

Thus, 50 of the 122 right handed students are female. Therefore, the probability that a right handed student selected at random is female is   the fraction  50/122

which to the nearest thousandth is 0.410.

T is average time spend by shoppers in minutes

N average number of shoppers.

Here, shoppers/hour =84.

Hence r=

60

84

​T=5

Hence N=rT=

60

84

​

×5=7

Average number of shoppers waiting at checkout =7

6 0
2 years ago
Read 2 more answers
A quadrilateral is a four sided polygon. True False
Viefleur [7K]
True

_____
"quad" is a prefix meaning 4.
"lateral" refers to sides.

"Quadrilateral" means "4-sided".
3 0
3 years ago
Read 2 more answers
Mark paid $54.60 to fill his car's gas tank. The gas tank was empty and the cost of gasoline was $3.90 per gallon.
Ray Of Light [21]
54.60/3.90=14
Mark’s gas tank will fill up with 14 gallons of gas.
4 0
3 years ago
The area of a rectangular fountain is x2 + 9x + 20 square feet. A 3-foot walkway is built around the fountain. Find the dimensio
Leto [7]

Answer:

(x+11) by (x+10)

Step-by-step explanation:

We know that Area = Length x width

Given: Area = x²+9x+20

Lets sort this out first

Area = x²+5x + 4x + 20

Area = x(x+5) + 4(x+5)

Area = (x+5) (x+4)

Therefore, it is concluded that:

Length 'l' = (x+5) feet

Width 'w' = (x+4) feet

if a 3-foot walkway is built around the fountain, we'll add 3 feet on both sides

Therefore,

Outer Length = (x+5+3+3) = (x+11) feet

Outer Width = (x+4+3+3) = (x+10) feet

Answer:

The fountain is (x+5) by (x+4).  

dimensions of the outside border of the walkway are (x+11) by (x+10)

8 0
3 years ago
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