Problem 7.25 The weekly mean return and volatility of the bond mutual fund PTTRX for the year 1999 are −0.0011 and 0.0058, respectively (see Table 1.13). The sample size for these data is n = 51 (see Table 1.19). From these data estimate the mean return and volatility of the PTTRX mutual fund for:

(a) one year.

(b) one quarter (13 weeks).

(c) Find a 95% confidence interval for the annual volatility.