In a country as vast and diverse as India, reliable data is the backbone of effective governance and policy-making. The Statistical System of India plays a crucial role in collecting, processing, analyzing, and disseminating data related to economic, social, and demographic aspects of the nation. From GDP estimation to employment statistics, the system ensures that decisions are based on scientific evidence rather than assumptions.

Importance of Data Quality in Official Statistics

ISS PREVIOUS YEAR 2016 PAPER-2 SOLUTION SET-A

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In a data-driven world, reliable and authentic data plays a crucial role in policy-making, research, and economic planning. India has a well-structured statistical system supported by various government institutions that generate official data across sectors like population, economy, labor , and development.

Which of the following statements are correct in order to obtain the hypothesis H0:β1=0H_0: \beta_1 = 0H0​:β1​=0 for the modelyi=β0+β1xi+εiy_i = \beta_0 + \beta_1 x_i + \varepsilon_iyi​=β0​+β1​xi​+εi​ ?

It is often stressful, overwhelming, and exhausting to prepare for examinations. One of the biggest challenges that students face is to maintain their level of motivation during their examination preparation journey. However, with the right mindset, it is easy to maintain motivation and do your best.

Let XXX be a random variable with probability generating functionP(s)=∑kpkskP(s) = \sum_{k} p_k s^kP(s)=∑k​pk​sk. Find the probability generating function of Y=2XY = 2XY=2X.

Question Let XXX be a Poisson variate with parameter λ\lambdaλ such that P(X = 2) = 2P(X = 4) + 20P(X = 6) What is the coefficient of skewness? Options: (a) 1/√3(b) 1(c) 1/2(d) −1/√3

Question What are Western Disturbances and Westerlies, and how are they different from monsoons? In which part of India are they mainly confined? ISS PREVIOUS YEAR GS 2016 Q.NO. 2(b)

One of the most common questions students ask while preparing for government exams is: “How many hours should I study every day?” Many students feel that they need to study 12–14 hours daily to succeed. But the truth is a little different.

Let the random variable X have the distribution: P(X = 0) = P(X = 3) = p P(X = 1) = 1 − 3p P(X = 2) = p where 0 ≤ p ≤ 1/2 Find the maximum value of V(X).

Which of the following statements are correct about the generalized inverse of a matrix A? A generalized inverse of a matrix is defined as A A⁻ A = A A generalized inverse is not unique. A matrix to have a generalized inverse must be non-singular. A matrix to have a generalized inverse may be either a square matrix or a rectangular matrix. Select the correct answer using the code given below:

What is Polar Shifting? Discuss its geographic significance with regard to catastrophic consequences on humanity.

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The Indian Statistical Service (ISS) exam is a highly specialized and competitive examination that demands strong conceptual clarity and consistent practice. Many aspirants often ask: “How should I study daily?” “What routine should I follow to crack ISS?”

A certain task can be accomplished in a factory by four different workers on five different types of machines. A sample study in context of a two-way design without repeated value is being made with two fold objectives of examining whether the four workers differ with respect to mean productivity and whether it is same for five machines. The researcher involved in this study reports gathered data as under : Sum of squares for variance between machines = 35.2 Sum of squares

(Indian Statistical Service) ISS PREVIOUS YEAR QUESTION PAPERS Indian Statistical Service (ISS) Previous Year Question Papers & Answer Keys – Year-