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Second differencing in time series can help to eliminate which trend?

(I) Quadratic trend

(II) Linear trend

If the first, second and third moment about origin are 2, 8 and 14. respectively, then Karl Pearson gamma coefficient of skewness y1 is:

Using the method of semi-averages, secular trend is measured when:

A Poisson distribution has a double mode at x = 1 and x = 2. The probability for x = 1 or for x = 2 of these two values is:

For a random variable x, the central moments (µi) of all order exist. The square of (2j + 1)^th   moment (µ²2j+1) is

Which option is incorrect for the component of ti.me series.

Which of the following options is correct when data is classified on the basis of attributes?

For the recorded observation, the coefficient of variation is 0.2 and the variance is 16. The arithmetic mean is:

Which is not relative measures of skewness?

The second quartile for the following data 38, 39, 40, 52, 59, 67, 73, 77, 149, 248 is: