Residents of three villages with three different types of water supply were asked to participate in a survey to identify cholera carriers. because several cholera deaths had occurred in the recent past, virtually everyone present at the time submitted to examination. the proportion of residents in each village who were carriers was computed and compared. classify this study:

Bonds often pay a coupon twice a year. for the valuation of bonds that make semiannual payments, the number of periods doubles, whereas the amount of cash flow decreases by half. using the values of cash flows and number of periods, the valuation model is adjusted accordingly. assume that a $1,000,000 par value, semiannual coupon us treasury note with three years to maturity has a coupon rate of 3%. the yield to maturity (ytm) of the bond is 7.70%. using this information and ignoring the other costs involved, calculate the value of the treasury note: