ICS Part 2 Online Preparation for Statistics Short questions Chapter Wise

What is the purpose of system software

• Ans 1: System softwarecontrols a computer's internal functioning, chiefly through an operating system, and also controls such peripherals as monitors, printers, and storage devices.

If St: deviation of a normal variate is 20, then what would be the value of M.D ?

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What is the maximum value of ordinate of Z and where it happens ?

• Ans 1: The maximum value of ordinate if f(z) = 0.3989 when Z = 0.

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What is simple random sampling ?

• Ans 1: The sampling scheme in which each element / group of elements of the population has an equal chance of selection for the sample.

Why we use a one-tail test in goodness of fit test ?

• Ans 1: In goodness of fit test we test the assumption that the difference between the observed and expected frequencies is not too large. We reject the assumption if difference is significantly large and that is why we use the right tail of sampling distribution as critical region.

What is a coefficient of correlation ? For what purpose it is used ?

• Ans 1: The coefficient of correlation is a measure designed to give the information about the nature and strength of the relationship existing between the two variables.

What are computers ?

• Ans 1: The computer is a useful machine. This amazing machine is working in almost every field of life. this complex machine, built of silicon metal and plastic. the computer is a device that has the ability to accept the data, internally store and execute a program of instructions, perform mathematical and other operations on data and report the results.We use computers in business, health care, education, science, engineering, military and many other fields.

Why correction for continuity is in above transformation ?

• Ans 1: To make discrete Binomial variable X as continuous Normal variable.

What is Binary Number system use in computer.

• Ans 1: In digit computer system all kind of data is represented in binary numbers. The binary numebr syste uses two digits 0 and 1 to represent any quantity. These digits are called binary numebrs...... The binary digit is abbreviated Bit.The base of binary number system is 2.

How many samples of size n can be drawn from a population having N elements when sampling is done with replacement ?

• Ans 1: Number of total possible samples will be Nⁿ.

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What are the demerits of moving average method ?

• Ans 1: It generates new cycles; fails to give a mathematical model for forecasting; some data are lost in the beginning and end.

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The two regression lines Y on X and X on Y intersect each other at a specific point in the rectangular coordinate system. What is that ?

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• Ans 1: V = (r - 1) ( c - 1)

What is meant by standard error of a statistic ?

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Giver at least one example for each component of time series.

• Ans 1: 1. Secular Trend: Population Control and process of industrialization.
  2. Cyclical: Business Cyclic and Fashion cycle.
  3. Seasonal: Eid's and Budgets.
  4. Irregular: Floods and Accidents.

What is meant by sampling distribution of means ?

• Ans 1: