A random sample of 50 households was selected for a

A random sample of 50 households was selected for a phone (landline and cell phone) survey. The key question asked was, "Do you or any member of your household own an Apple product (iPhone, iPod, iPad, or Mac computer)?" Of the 50 respondents, 20 said yes and 30 said no.
a. Determine the sample proportion, p, of households that own an Apple product.
b. If the population proportion is 0.45, determine the standard error of the proportion.