Statistics
Test 2
Marks: 30
Time: 60 min
Note: All problems are to be solved using SPSS. You can copy and paste the data from this Word document into SPSS – (the pasted data may require some rearranging before you can analyze it!).
Write a brief report of your findings in the answer book. 1. An electric goods company arranged a training program for its employees. The company wants to measure the change in the attitude of its employees after the training. For this purpose a questionnaire is used, which consists of 10 questions on a 1 to 5 rating scale (1 is strongly disagree and 5 is strongly agree). The company selected a random sample of 10 employees. The scores obtained are given below. Determine whether there is a change in the attitude of the employees after the training program. (10) Before training | After training | 25 | 32 | 26 | 30 | 28 | 32 | 22 | 34 | 20 | 32 | 30 | 28 | 22 | 25 | 20 | 30 | 21 | 25 | 24 | 28 |
2) The following data show the annual salary for 30 different jobs in three fields: Computer software & hardware, construction and engineering: (10) Computer | Constr. | Engineer | 94 | 55 | 75 | 90 | 53 | 70 | 63 | 77 | 88 | 84 | 60 | 77 | 73 | 41 | 89 | 75 | 54 | 85 | 94 | 51 | 96 | 77 | 64 | 105 |
Test for any significant difference in the mean annual salary among the three job fields.
3) A market is controlled by two leading companies – A and B. Company A is concerned that a sizable number of its customers may shift to company B because of an aggressive advertising campaign launched by it. In order to assess the anticipated customer shift, the researchers at company A have prepared a questionnaire consisting of 10 questions, on a five-point rating scale (1is strongly disagree and 5 is strongly agree). It has been administered to 10 randomly selected customers of company A and 12 randomly selected customers of company B. The scores obtained are given in the following table. Test whether there is a difference in the mean scores obtained from the customers in the population. (10) Company A | Company B | 40 | 30 | 42 | 31 | 39 | 32 | 38 | 34 | 41 | 35 | 37 | 32 | 38 | 30 | 39 | 34 | 40 | 35 | 41 | 36 | | 32 | | 31 | 