The values of '$a$' and '$b$' if the equation of straight line trend by least square method is given by $y = a + bx$ such that $\sum x = 0$, $\sum y = 84$, $\sum xy = 108$, $\sum x^2 = 70$ for 6 observation at are:

Let $y_t=a+b(x_i-2021)$ be the straight line trend for the following data by least squares method:

the trend value for the year 2025 approximately is:

Consider the following data:

By using the method of least squares, the trend value for 1997 is :

Match List-I with List-II

Choose the correct answer from the options given below:

Which of the following statement(s) mentioned below do/does not specify the concept of time series analysis:-

A. Time series analysis comprises methods for analysing time series data in order to extract meaningful statistics and other characteristics of the data.

B. Time series analysis provides good forecasts or predictions of further values of the time series.

C. The time series analysis does not derive conclusions after arranging the time series in a systematic manner.

D. The measurement analysis and study of components of time series is called time series analysis.

Choose the correct answer from the options given below:

The sale of ice creams is higher in summer than in winter is an example of

Consider the following data:

Using method of least squares, the trend value for year 2004 will be