1. BB research is a not-for-profit organization in Australia. They seek your help to decide the sampling plan one would choose to collect data for the following research. In each case, you are required to explain (a) the minimum of two alternative sampling methods, (b) the importance of each method for the research and (c) the process of sampling with hypothetical data on population and sample.
   1. The government wants to analyse the peoples' desire for covid vaccination and willingness to help for government plan for Covid free Australia
   2. A group of researchers wants to estimate the living standard of people in regional Victoria.
2. The following table shows the monthly adverting expenditure and sales revenue of a company. You are required to estimate the covariance and correlation coefficient and explain what do these statistics tell you about the relationship between two variables and advice the company.

Sales revenue ($M)	9.6	11.3	12.5	9.5	8.5	12	11.4	12.5	13.8	14.6
Advertising expenditure ($000)	23	40	55	54	28	25	31	36	88	90

(Please don't use excel calculation)