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Pie
11 days ago
9

According to Eurostat, 55.2% of households in Italy have one child, the highest percentage in the Euro zone. A random sample of

160 Italian households was selected. The standard error of the proportion is ________.
Mathematics
1 answer:
Inessa [12.1K]11 days ago
3 0

Response:

0.04

Detailed explanation:

In this scenario, we will apply the following formula to determine the standard error, specifically the square root of the probability of its complement divided by the total population:

SE= \sqrt{\frac{p *(1-p)}{n} } \\

Now, given that p = 0.552 and n = 160, substituting these values leads to:

SE =  \sqrt{\frac{0.552 *(1-0.552)}{160} } \\

SE = \sqrt{0.00154}

SE = 0.039

This indicates that the proportion's standard error is 0.04

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a sign says that the price marked on all music equipment is 30% off the original price you buy an electric guitar for sale price
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The original price stands at $450.

Step-by-step explanation:

Step 1:

Given information, Discount%, D% = 30 and Selling Price, SP = $315

Step 2:

Formulate the equation for determining the Original Price

Selling Price (SP) = Original Price (OP) - Discount (D)

Discount (D) = Original Price (OP) * (D%/100)

Step 3:

Plug in the known values into the formula

315 = OP - D

D = OP \times30/100

D = 0.3 OP

Step 4:

Insert the value of D back into the initial equation

315 = OP - 0.3 OP

315 = OP (1 - 0.3) = 0.7 OP

A resulting Original Price of OP = 315/0.7 = $450

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1 month ago
Cooper is measuring ingredients for his special dessert. He needs a total of 70.4 mL of milk and melted butter. The recipe calls
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Cooper requires 39.8 mL of milk for his recipe.
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12 days ago
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If the roads leading to an arena can together handle 3,500 vehicles/hour of arena-only traffic, at what time should the roads be
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The given road capacity is 3,500 vehicles per hour, and the expected number of vehicles arriving is 14,000. To calculate the time required for these vehicles to access the arena:
14,000 vehicles divided by 3,500 vehicles per hour equals 4 hours.

If the event is scheduled to commence at 7 p.m., the roads should close at: 7 p.m. minus 4 hours, which results in 3 p.m.
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In isosceles △ABC (AC = BC) with base angle 30° CD is a median. How long is the leg of △ABC, if sum of the perimeters of △ACD an
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Important details about isosceles triangle ABC:

  • The median CD, which is drawn to the base AB, also acts as an altitude to that base in the isosceles triangle (CD⊥AB). This indicates that triangles ACD and BCD are congruent right triangles, each with hypotenuses AC and BC.
  • In isosceles triangle ABC, the sides AB and BC are equal, meaning AC=BC.
  • The base angles at AB are equal, m∠A=m∠B=30°.

1. Consider the right triangle ACD. The angle adjacent to side AD is 30°, which dictates that the hypotenuse AC is double the length of the opposite side CD relating to angle A.

AC=2CD.

2. Now, for right triangle BCD, the angle next to side BD is also 30°, so hypotenuse BC is twice the opposite leg CD linked to angle B.

BC=2CD.

3. To calculate the perimeters of triangles ACD, BCD, and ABC:

P_{ACD}=AC+CD+AD=2CD+CD+AD=3CD+AD;

P_{BCD}=BC+CD+BD=2CD+CD+AD=3CD+AD;

P_{ABC}=AC+BC+AB=2CD+2CD+AD+BD=4CD+2AD.

4. If the total of the perimeters of triangles ACD and BCD is 20 cm greater than the perimeter of triangle ABC, then

P_{ACD}+P_{BCD}=P_{ABC}+20,\\ \\3CD+AD+3CD+AD=4CD+2AD+20,\\ \\6CD+2AD=4CD+2AD+20,\\ \\2CD=20.

5. Given that AC=BC=2CD, the lengths of legs AC and BC of the isosceles triangles are 20 cm.

Answer: 20 cm.

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<span>I'm fairly certain it's C $0.12


Good luck! I hope I was able to assist:)
</span>
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