Business Statistics Old Question Paper Year 2018

Table of Contents

Brief Answer Questions: [4×2=8]

1) What is sampling? List down the various random sampling techniques.
2) One hundred and twenty Students appeared for a English class test and following are the marks distribution.

Marks	0-20	20-40	40-60	60-80	80-100
No. of students	10	25	40	30	15

Find the modal marks of the students.

3) A bag contains 3 red, 2 black and 5 white balls. If two balls are drawn at random, what is the probability of getting () both red balls (ii) both white balls.
4) A random sample of 100 patients suffering from a certain disease was given a serum treatment. It was observed that 80% were relieved of the disease. Find 99% confidence limits for the percentage of patients cured.

Short Answer Questions: [4×3=12]

(i)P(x = 0) (ii) (x<=1) (ii) P(x >= 2)

Which model of refrigerators has greater uniformity in life?

Income ‘000’ Rs:	0-50	50-100	100-150	150-200	200-250	250-300
No. of employees	40	160	200	100	70	30

Find the lowest income of richest 15% of employees.

8) The following table gives the information of average number of articles produced by Machine A and Machine B respectively with their standard deviations. Test whether the both machines equally efficient on the basis of 50 days of production at 5% level of significance.

Comprehensive Answer Questions:

9) The following table gives aptitude test scores and productivity indices of 8 randomly selected workers. Find the correlation coefficient aptitude score and productivity index.

Aptitude score	57	58	59	59	60	61	62	64
Productivity score	67	68	65	68	72	72	69	71

Estimate the productivity index of a worker whose test score is 66.

From the following distribution, find skewness and kurtosis. Also comment on the results.

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Business Statistics Old Question Paper Year 2018 – Tribhuvan University | BBA