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koban [17]
3 years ago
13

Consider random samples of size 80 drawn from population A with proportion 0.48 and random samples of size 66 drawn from populat

ion B with proportion 0.13 . (a) Find the standard error of the distribution of differences in sample proportions, . Round your answer for the standard error to three decimal places. standard error
Mathematics
1 answer:
gogolik [260]3 years ago
5 0

Answer:

Standard error = 0.070

Step-by-step explanation:

Formula for the standard error of the distribution of differences in sample proportions is;

σ_(A - B) = √((p_a^(1 - p_a^)/n_a) + (p_b^(1 - p_b^)/n_b))

We are given;

p_a^ = 0.48

n_a = 80

p_b^ = 0.13

n_b = 66

Thus;

σ_(A - B) = √((0.48(1 - 0.48)/80) + (0.14(1 - 0.13)/66))

σ_(A - B) = √0.00496545455

σ_(A - B) = 0.070

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kims family spends $62.50 on dinner.they leave an 18% tip. how much is their total bill after their tip
ser-zykov [4K]

Answer:

73.75

Step-by-step explanation:

6 0
2 years ago
Question #7multiplechoice score: in a certain candy store, 3 pounds of candy and 2 pounds of mints cost $10.80, and 1 pound of c
irga5000 [103]
Let the cost of one pound of candy be x and one pound of mint be y.

3x+2y=10.8 a 
x+3y = 5.35  b 
 B*3 = 3x+9y = 16.05 b
 
b-a = 7y = 16.05-10.8= 5.25
           y = 5.25/7 = 0.75 

The cost per pound of mints is $0.75 


6 0
3 years ago
Solve this by substitution
frozen [14]

Answer:

y= 1 and x=-2

Step-by-step explanation:

Since they both equal y, you can equal them to each other:

x + 3 = 2x + 5

Then solve:

x - x + 3 = 2x - x + 5

3 - 5 = x + 5 - 5

-2 = x

Substitute x in either equation to solve for y:

y = (-2) +3

y = 1

Or the other equation:

y = 2(-2) + 5

y = -4 + 5

y = 1

hope this helps :)

6 0
2 years ago
Please solve
raketka [301]

Step 1. Simplify 1/3x to x/3

-x/3 > 5

Step 2. Multiply both sides by 3

-x > 5 * 3

Step 3. Simplify 5 * 3 to 15

-x > 15

Step 4. Multiply both sides by -1

x < -15

Your answer is A.

7 0
3 years ago
Can yall pleas help me with this!!!!!!!
Tamiku [17]

Answer:

#5 ∠RST , Obtuse

#6 ∠XYZ, Right

#7 ∠ABC, Straight

#8 ∠HFG, Acute

#9 ∠JPM, Acute

#10 ∠EDF, Right

Hope this helps :)

7 0
3 years ago
Read 2 more answers
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