According to a newspaper, 67% of high school seniors have a driver's license. Suppose we take a random sample of 200 high school seniors and find the proportion who have a driver's license.

a. What value should we expect for our sample proportion?

We should expect a sample proportion of ____%.

(Type an integer or a decimal. Do not round.)

b. What is the standard error?

c. Use your answers to parts (a) and (b) to complete this sentence: We expect ____% to have their driver's license, give or take _____%.

d. Suppose we increased the sample size from 200 to 800. What effect would this have on the standard error? Recalculate the standard error to see if your prediction was correct.