For each of the following, calculate the z-statistic. (Round your answers to two decimal places.) (a)sample size n = 30; sample proportion p̂ = 0.55 H0: p = 0.50 Ha: p ≠ 0.50 z =_______ (b) sample...

For each of the following, calculate the z-statistic. (Round your answers to two decimal places.)

(a)sample size n = 30; sample proportion p̂ = 0.55

H0: p = 0.50

Ha: p ≠ 0.50

z =_______

(b) sample size n = 50; sample proportion p̂ = 0.22.

H0: p = 0.25

Ha: p <>

z =________