The Residential Energy Consumption Survey found in 2001 that 47% of American household had internet access. A market survey organization repeated this study in a certain town with 25,000 households, using a simple random sample of 500 households: 239 of the same households had internet access. a) The percentage of households in the town with internet access is estimated at ; this is likely to be off by ___ or so. b) If possible, find a 95%-confidence interval for the percentage of all 25,000 households with internet access. If this is not possible, explain why or why not.

47.8%

2.23%

43.34% ; 52.26%

Step-by-step explanation:

A.) percentage household with internet access:

Numner with internet access / samples size

239 / 500

= 0.478 ; 0.478 * 100% = 47.8%

Standard deviation :

Sqrt(Proportion with internet access) * proportion without internet access)

Sqrt[(0.478) * (1 - 0.478)]

= 0.4995

Standard Error of estimate = 0.4995 * √sample size

= 0.4995 * √500

= 11.16

To percentage ;

(11.16/ 500) * 100

= 2.23%

Confidence interval :

Sample percentage ± 2(percentage standard error)

= 47.8 + 2(2.23) = 52.26%

= 47.8 - 2(2.23) = 43.34%

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc

idk u tell me

step-by-step explanation: