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Sindrei [870]
3 years ago
13

Help Please!!

Mathematics
1 answer:
Finger [1]3 years ago
6 0
Answer is A. r must be such that
-1 ≤ r ≤ 1
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As discussed in Exercise 6.10, the General Social Survey reported a sample where about 61% of US residents thought marijuana sho
Maslowich

Answer: 2285

Step-by-step explanation:

Formula to find the sample size is given by :-

n=p(1-p)(\dfrac{z_c}{E})^2

, where p = prior estimate of population proportion.

E= Margin of error.

z_c = z-value for confidence interval of c.

Given : Confidence interval : 95%

From the z-value table , the z-value for 95% confidence interval = z_c=1.96

The General Social Survey reported a sample where about 61% of US residents thought marijuana should be made legal.

i.e. the prior estimate of population proportion of US residents thought marijuana should be made legal : p=0.61  

 [∵ sample proportion is the best estimate for population proportion.]

Margin of error : E= 2%=0.02

Now, the required minimum sample size would be :-

n=0.61(1-0.61)(\dfrac{1.96}{0.02})^2

Simplify ,

n=0.2379\times9604=2284.7916\approx2285

Thus , we need to survey <u>2285</u> Americans .

4 0
3 years ago
Help me answer please
fiasKO [112]

Answer:

25

Step-by-step explanation:

b=4x+1    h=x+1     A=175

A=bh

Substitute: 175=(4x+1)(x+1)

Expand: 175=4x^2+5x+1

Subtract 175

4x^2+5x-174=0

Solve w/quadratic formula

(-5 <u>+</u> sqrt(25+2784))/8

Simplify: x=6 or -29/4

Distance is positive, so x=6

4x+1=4*6+1=25


6 0
3 years ago
Find the difference.<br> -6 2 1411 1-6 (-1)5<br> 10.-9.18][ 3 14<br> ol<br> -51]
scoray [572]

Answer: This problem is all mixed up. There is no way to solve it with it like this.

Step-by-step explanation:

8 0
3 years ago
Divide 33 photoes into 2 groups so the ratio is 4 to 7
natali 33 [55]

Answer:

12:21

Step-by-step explanation:

4 + 7 = 11

33/11 = 3

3x4=12 & 3x7=21

Therefore, ratio is, 12:21

3 0
3 years ago
Read 2 more answers
2(3x + 1) - (x - 5) = 42
lbvjy [14]

Answer:

6x+2-1x+5=42

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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