According to a newspaper, 77% of high school seniors have a driver's license. Suppose we take a random sample of 200 high school seniors and nd the proportion who have a driver's license. a. What value should we expect for our sample proportion? b. What is the standard error? 0. 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 600. What effect would this have on the standard error? Recalculate the standard error to see if your prediction was correct. a. We should expect a sample proportion of %. (Type an integer or a decimal. Do not round.)