Vivian Thompson is an expert in bank sector. He is invited to Vpbank in Vietnam to manage a new project in 4 years, starts in January, 2018. Vpbank pays him
monthly incomes as following:
- Salary: 6000 USD
- Moving allowance: 400 USD
- Job allowance: 200 USD
◦ Requirement:
◦ Determine the amount of personal income tax that the expert has to pay to Vietnam
Tax Office in this year. The exchange rate used in tax calculating is 1USD= 23.500
VND.
◦ Additional details:
- Vivian is living in a house which the company rented for him with the price of 1000 USD
per month. He usually stays in Vietnam 250 days annually and doesn’t get any earnings
from abroad. He has two declared dependents.
- He got a bonus of 2.000 USD for his contributions to project succeed at the end of this
year.

You are in charge of the customer service phone line with many employees. at the end of each phone callthe customers are asked to rate their service from 1 to 5 stars, with 5 being the best. you find the averagerating for 20 randomly selected employees and decide you want to improve the ratings so you require thoseemployees to go through a new training program. you then wait a week and find the new average rating foreach employee. the average change is an increase in 1.3 stars with a standard devation of .9 stars.(a) is this data paired or not paired? (b) what are the null and alternative hypothesis being tested? (c) what is the t-statistic you would use? write the general formula and the final calculation.(d) sketch a t-distribution, label your t-statistic and the probability you would be interested in: