The assignment content includes four parts: a, b, and c. In part (a), the examiner wants to determine the sample size required for a test with a power of 0.90 when the difference between the true mean and hypothesized mean is 1.4σ. The answer can be obtained using Table 10, OC curves Table 16(f), or Minitab. In part (b), an experiment was conducted to study the effect of wind on motorcycle acceleration, where motorcyclists drove their motorcycles with and against the wind direction. A 91% confidence interval for the difference between means is required. In part (c), two surveys were conducted: one about Saudi International airports and another about improving education in Saudi Arabia. The first survey tests whether there is a significant relationship between passenger's city and international airport used, while the second survey tests whether opinions concerning TOEFL certificate are the same within each group of schools' students. Finally, part (c) involves testing whether three sales offices have the same percentage of deals.