Question 925783
Ho: p = .35 (claim)
Ha: p ≠  .35
....
re TY, No, do a z-stat... .44 did not happen by accident...claim is rejected
sample: phat = 110/250 = .44
z(.44) = ( .44-.35)/sqrt[0.35*.65/250] = .09/.03 = 3 (Off the charts)
p(z > 3) = .001 < .10   Reject Ho
.....
Estimate the true proportion of regular voters with 90% confidence
ME = 1.645 sqrt[0.35*.65/250] = .049  (Used the old .35 here to calculate ME)
CI:  .44 - .05 < u < .44 + .05  (Used the .44 here)
CI: (.39, .49)