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When data of the variable is collected at distinct time intervals for a specified period of time, it is called

Which of the following statements are correct?

(A) The method of least squares determines the position of the trend line of the given time series.

(B) The trend line is called the line of best fit.

(C) The line of best fit is a line in which the sum of deviations of the actual values of the variable from their corresponding trend value is always positive.

(D) The normal equations of the trend line $y = a + bx$ are $\sum y = na + b \sum x$ and $\sum xy = a \sum x + b \sum x^2$, where $n$ is the numbers of observations.

Choose the correct answer from the options given below:

If $y = 38.85 + 7.64(x - 2020)$ is the equation of the straight line trend for the following data:

The trend value for the year 2021 by least square method is:

In which of the following, the time series may show the gradual shifts to relatively higher or lower values over a long period of time?

In the month of January, the number of cases diagnosed of influenza epidemic are given in the following table

The 3-day moving averages are:

For the given five values $12,15,18,24,36$; the three-year moving averages are :

Which of the following are components of a time series ?

(A) Irregular component

(B) Cyclical component

(C) Chronological Component

(D) Trend Component

Choose the correct answer from the options given below :