Suppose that observations on a stock price (in dollars) at the end of each of 20 consecutive weeks are as follows:
$50.00; $50.92; $50.30; $50.67; $50.57; $49.51; $48.03; $48.09; $46.65; $47.96; $48.64; $49.10; $49.53; $50.77; $51.52; $52.52; $53.82; $53.11; $53.03; $53.43
a. Estimate the stock price volatility: = _______________________.
b. What is the standard error of your estimate?_______________.