Question:

Given the table: Class Interval 10 – 15 15 – 20 20 – 25 25 – 30 30 – 35 Frequency 5 7 4 6 8 The class mark for the second class is

A.

27.5

B.

17.5

C.

12.5

D.

32.5

Answer» b. 17.5

Question:

For a symmetrical distribution first quartile and median are respectively 20 and 24. Thethird quartile of the distribution is

A.

28

B.

26

C.

22

D.

32

Answer» a. 28

Question:

Standard Deviation (S.D) for two observations 1 and 4 is

A.

1

B.

1.5

C.

2

D.

3

Answer» b. 1.5

Question:

If the two regression coefficients are byx = – 0.4 and bxy = – 0.9 then the value ofcorrelation coefficient (r) is

A.

0.6

B.

0.65

C.

– 0.6

D.

– 0.65

Answer» c. – 0.6

Question:

The quartile deviation of the following data 12, 10, 17, 14, 19, 21, 27, 30, 32, 38, 34 is

A.

11

B.

18

C.

9

D.

16

Answer» c. 9

Question:

A random variable X can take the values -1, 0 and 1 with respective probabilities 0.2,0.5 and 0.3. The expected value of X is:

A.

0.3

B.

0.5

C.

0.2

D.

0.1

Answer» d. 0.1

Question:

Given : Q3 – Q1 = 8, Q3 + Q1 = 22, Median (Q2) = 10.5. The coefficient of skewness is

A.

1/8

B.

1/7

C.

1/5

D.

1

Answer» a. 1/8

Question:

The correlation coefficient between two variables x and y is

A.

sum of two regression coefficients.

B.

Arithmetic Mean of two regression coefficients.

C.

Harmonic Mean of two regression coefficients.

D.

Geometric Mean of two regression coefficients.

Answer» d. Geometric Mean of two regression coefficients.

Question:

The measure of central tendency of a statistical data which takes into account all thedata

A.

Median

B.

Mean

C.

Mode

D.

Range

Answer» b. Mean

Question:

Given a table: Value (greater than) 100 150 200 250 Frequency 50 32 9 0 The number of observations between 150 and 200 is

A.

23

B.

15

C.

8

D.

18

Answer» a. 23