An Equation for the Random Walk Model Is Given by the Equation

True/False

An equation for the random walk model is given by the equation: $D Y _ { t } = \mu + \varepsilon _ { t }$
,where $D Y _ { t }$
is the change in the time series from time t to time t - 1, $\mu$
is a constant,and $\varepsilon _ { t }$
is a random variable (noise)with mean 0 and some standard deviation $\sigma$
.