CUET Mathematics 2025 21 May Shift 1 PYQs

Which of the following are examples of irregular trends in a time series?

(A) Decrease in production due to a sudden strike.

(B) The rise in prices before festivals

(C) Unusual rise in income of the printing press due to the announcement of an election.

(D) Fall in crop yield due to floods.

Choose the correct answer from the options given below:

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 $\sum y = na + b\sum x$, $\sum x \cdot ext{and} \sum xy = a\sum x + b\sum x^2$, where $n$ is the numbers of observations.

Choose the correct answer from the options given below:

In a time series, the variations which occur due to general tendency of the data to increase or decrease over a long term are known as: