A random selection of 64 households was selected for a telep

A random selection of 64 households was selected for a telephone survey. The key question asked was,

Solution

Out of 64 respondents, 48 said yes and 16 said no

n = 64

a) proportion of households with cellular telephones that can be used to access the internet = 48/64 = 0.75

b) Std error = sqrt[phat * (1 - phat)/n] = sqrt[0.75 * (1 - 0.75) / 64] = 0.054