STA301 Final Term MCQs

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Which is not a source of existing statistics?

➢ Government ➢ International agencies ➢ Personal interviews ➢ Private sources

Followings are the advantages of secondary data except

➢ Non-Reactivity ➢ Selective survival ➢ Low cost ➢ Spontaneity

Following are the disadvantages of secondary data except

➢ Longitudinal analysis ➢ Sampling bias ➢ Coding difficult ➢ Incompleteness

The coding of the secondary data may be difficult because of

➢ Differences in content or subject matter ➢ Lack of standardization ➢ Differences in length and format ➢ All of these

The researcher must be concerned about the following problems while using secondary data in research.

➢ Validity ➢ Reliability ➢ All of these If a random variable X denotes the number of heads when three distinct coins are tossed, the X assumed the values:

➢ ► 0,1,2,3 rep ➢ ► 1,3,3,1 ➢ ► 1, 2, 3 ➢ ► 3, 2

When c is a constant, then E© is:

➢ ► 0 ➢ ► 1 ➢ ► c ➢ ► -c

When the random variable X and Y are independent, its co-variance is:

➢ ► One ➢ ► Negative ➢ ► Zero ➢ ► Positive

If X and Y are independent variables, then E (XY) is:

➢ ► E(XX) ➢ ► E(X).E(Y) ➢ ► X.E(Y) ➢ ► Y.E(X)

Which dispersion is calculated from all the observations?

1. ➢
2. Standard deviation
3. ➢
4. Quartile deviation
5. ➢
6. Rang
7. ➢
8. Coefficient of Rang