Author Question: The F-distribution is the sampling distribution of the ratio of: a. two sample variances. b. two ... (Read 42 times)

bobbysung · **on:** Jun 24, 2018

The F-distribution is the sampling distribution of the ratio of:
a. two sample variances.
b. two normal population means.
c. two normal population variances.
d. None of these choices.

Question 2

The formula St = wyt + (1 - w)St-1 is used in time-series forecasting with exponential smoothing, where St is the exponentially smoothed time series at time t, yt is the value of the time series at time t, and w is the smoothing constant. The forecasted value at time t + 1 where w = .4 is given by:
a. Ft + 1 = 0.4yt +1 + 0.6St + 1 c. Ft + 1 = 0.4yt + 0.6St - 1
b. Ft + 1 = 0.4yt + 0.6St d. Ft + 1 = 0.4yt - 1 + 0.6St