Sri Ganganagar Management College

M.B.A.second Semester

First Mid Term Exam

Sub: Research Methods in Management

MM: 30 Max Time: 90 Minutes

Note: All Questions Are Compulsory.

1. (A) Explain following:

(a) Type-I error and Type-II Error (b) Level Of significance and level of confidence(c) Sampling frame and population (d) statistic and parameter

(B) Differentiate between sampling errors and non sampling errors? Can these be eliminated? Explain (8)

2. What do you understand by probability and non-probability sampling? Explain different methods of sampling by taking appropriate examples. Give their merits and demerits? (10)

3. A simple random sample is to be taken from a population of 50,000 sale invoices to estimate the mean amount per invoice. The standard deviation of the population is 4000.the allowable error is 200 and the confidence coefficient is 90 %( z=1.64).what size of sample is appropriate? (4)

4. The table given below shows the data obtained during outbreak of smallpox:

Attacked not attacked total

Vaccinated 31 469 500

Not vaccinated 185 1315 1500

Total 216 1784 2000

Test the effectiveness of vaccination in preventing the attack from smallpox. Test your result at 5% level of significance. (5)

5. the mean produce of wheat of a sample of 100 fields is 200lbs. per acre with a standard deviation of 10 lbs. another samples of 150 fields gives the mean of 220 lbs. with a standard deviation of 12 lbs. can the two samples be considered to have been taken from the same population whose standard deviation is 11 lbs.? Use 5 percent level of significance. (3)