## OLD PAPERS CODE 395 SPRING 2014 INTERMEDIATE

Past or old paper for course code 395 semester spring 2014 which relate with Statistics – II for the students of B.com level. First , second, third questions of this paper is in soft form while the other question along with these question are in hard form.

**Q01:** Fill in the Blanks.

i) The limits µ ± 3σ include **99.73** percent area under the normal curve.

ii) In normal distribution, MD =≈ **415** σ.

iii) **NON SAMPLING** errors may arise due to faulty sampling frames, non-responses and processing of data.

iv) The standard error can be reduced by increasing the **SAMPLE SIZE.**

v) The width of a confidence interval **DECREASES** if the sample size is increased.

vi) The **NUL** hypothesis always contains some form of an equality sign.

vii) The correlation coefficient is **independent** of the change in origin and unit of measurement.

viii) The degree of linear relationship between the two variables is called **CORRELATION.**

ix) The graph of time series is called **HISTOGRAM**.

x) The secular trend is measured by a straight line when a time series has a **UPWARD trend.**

** Q 02:**

A) What is the importance of normal distribution? Write any five properties of normal distribution.

B) In normal distribution mean is 20 and standard deviation is 5, find the following:-

i) P(15 ≤ x ≤ 22) ii) P(x ≤ 18).

**Q 03:**

A) Explain the following terms:

i) Bias, ii) Standard Error, iii) Finite Population, iv) Infinite Population.

B) A population consists of four values 1, 5, 7 and 11. Take all possible samples. Compare the mean and S.D of it with the mean and standard deviation of the population.