A music industry researcher wants to estimate, with a 90% confidence level, the proportion of young urban people (ages 21 to 35 years) who go to at least 3 concerts a year. Previous studies show that 21% of those people (21 to 35 year olds) interviewed go to at least 3 concerts a year. The researcher wants to be accurate within 1% of the true proportion. Find the minimum sample size necessary.

21378

Step-by-step explanation:

The confidence level is 90%, which gives us a Z of 1.645.

Our equation is (Z^2*p*q)/e^2

(1.645^2*p*(1-.21))/ (.01^2)

E is the error proportion, .01

Q is 1-p or the proportion

P is the pop you need

With this, we can solve

and get p = 21377.5975 and rounded to 21378

Iii. this is basically double integrals. i'll try my best to answer this, though there's not much i can do since the question is kind of vague.you should be given (or find) the equation that yields the line that marks the area of the region. this will be your function. the bounds should be given (or you should find them with the graph). find the domain and range. these will be the values you put on the integral signs. it doesn't matter which set you assign to the choose one that will make solving easier.take the integral (inner one) of the function with respect to dx or dy. this depends on which bound you set first and second. then do it again with the outer integral with respect to dx or dy (which ever one you didn't do first).good luck.