You are hired by a university to estimate the percentage of students that oppose the alcohol policy at the university. How many students should you sample to be 95% confident of falling within 2 percentage points of the true population percentage? Assume a pilot study has been done estimating the percentage to be 60%. Please help! This is for my business Statistics class.

Y=4x^2+x-1 solve using quadratic formula

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)