Auniversity surveyed recent graduates of the english department about their starting salaries. four hundred graduates returned the survey. the average salary was $25,000. assume for purposes of this problem that the population standard deviation is known, and it is $2,500. what is the 95% confidence interval for the mean salary of all graduates from the english department?

  (24755, 25245)

Step-by-step explanation:

Given : Sample size : n= 400

Sample mean :

Standard deviation :

Significance level :

Critical value :

The confidence interval for population mean is given by :-

Hence, the 95% confidence interval for the mean salary of all graduates from the English department is (24755, 25245)

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