STA1610/015/0/2025
Tutorial Letter 015/0/2025
Introduction to Statistics
STA1610
Year module
Department of Statistics
Assignment 5 questions.
, STA1610/015/0/2025
ASSIGNMENT 05
Unique Nr.: 867182
Fixed closing date: 08 September 2025
Study Units 10 and 11 or Chapters 14 and 12 of the text-book Statistics for
Business and Economics 6th edition by Anderson. (2024) before attempting these
questions. Give full calculations, using correct mathematical and statistical
notation.
1. The results of ComputerWorld’s annual job satisfaction exercise showed that
28 percent of information systems managers are very satisfied with their job,
46 percent are somewhat satisfied, 12 percent are neither satisfied nor
dissatisfied, 10 percent are somewhat satisfied, and 4 percent are very
dissatisfied. Suppose that a sample of 500 computer programmers yielded the
following results.
Category Number of respondents
Very Satisfied 105
Somewhat satisfied 235
Neither 55
Somewhat dissatisfied 90
Very dissatisfied 15
Taking the ComputerWorld figures a ‘population’ values, use 𝛼𝛼 = 0.05 and test to
determine whether the job satisfaction for computer programmers is different from
the job satisfaction for information system managers. 13
2. One of the questions on Business week subscriber study was, ‘In the past 12
months, when travelling for business, what type of airline ticket did you
2
Tutorial Letter 015/0/2025
Introduction to Statistics
STA1610
Year module
Department of Statistics
Assignment 5 questions.
, STA1610/015/0/2025
ASSIGNMENT 05
Unique Nr.: 867182
Fixed closing date: 08 September 2025
Study Units 10 and 11 or Chapters 14 and 12 of the text-book Statistics for
Business and Economics 6th edition by Anderson. (2024) before attempting these
questions. Give full calculations, using correct mathematical and statistical
notation.
1. The results of ComputerWorld’s annual job satisfaction exercise showed that
28 percent of information systems managers are very satisfied with their job,
46 percent are somewhat satisfied, 12 percent are neither satisfied nor
dissatisfied, 10 percent are somewhat satisfied, and 4 percent are very
dissatisfied. Suppose that a sample of 500 computer programmers yielded the
following results.
Category Number of respondents
Very Satisfied 105
Somewhat satisfied 235
Neither 55
Somewhat dissatisfied 90
Very dissatisfied 15
Taking the ComputerWorld figures a ‘population’ values, use 𝛼𝛼 = 0.05 and test to
determine whether the job satisfaction for computer programmers is different from
the job satisfaction for information system managers. 13
2. One of the questions on Business week subscriber study was, ‘In the past 12
months, when travelling for business, what type of airline ticket did you
2
