Astudy was conducted to determine if the salaries of firefighters from two neighboring cities were different. a sample of 75 firefighters from each city was randomly selected. the mean from the first city was $38,200 with a population standard deviation of $3100. the mean from the second city was $40,150 with a population standard deviation of $3300. construct a 99% confidence interval for μ1 - μ2.

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl