Which of the following is false for a white noise process?a. zero meanb. finite variancec. independent and identically distributed (iid)d. volatility clustering

A white noise process has the following characteristics: a. Zero mean: This is true. A white noise process has a constant mean that is equal to zero. b. Finite variance: This is true. The variance of a white noise process is constant and finite. c. Independent and identically distributed (iid): This is true. The observations in a white noise process are independent and identically distributed. d. Volatility clustering: This is false. In a white noise process, there is no volatility clustering. Volatility clustering refers to the phenomenon where periods of high volatility are followed by periods of high volatility and periods of low volatility are followed by periods of low volatility. This does not occur in a white noise process. ####

When do you say that a Time Series is white noise?Answer choicesSelect only one optionREVISITWhen it has a constant mean of zero, a constant variance and there is a correlation between its values at different timesWhen it has a constant mean of zero, a constant variance and no correlation between its values at different timesWhen it has a constant mean of one, a constant variance of zero and no correlation between its values at different timesNone of the above

1. Suppose that the simple return of a stock follows the modelrt = 0.1 + at − 0.5at−2,where {at}Tt=1 follows a white noise process with mean zero and variance σ2a = 0.04. Pleasecompute the following:(a). What is the mean of rt?(b). What is the variance of rt?

Which of the following property is not true for a random walk process?a. volatility clusteringb. nonstationaryc. strong memoryd. has a unit root

Which of the following statements is true?Group of answer choicesThe sum of the deviations from each value in a data set to the mean, is always zero.The sum of the squared deviations from the mean is always zero.The standard deviation is in squared units.The standard deviation is always greater than the variance.