Hi, please show your work so I can understand. Also please write clearly so I can read. I will give positive feedback! Also, pleasure ensure calculation are done to the 4th decimal place. Thank you for your help!

Market Researchers have become more interested in the potential of social networking sites. But they need to understand the demographics of social networking users. A recent survey showed that 22 of the 31] respondents who reported earning less than SEQDUD per year said that they were social networking users. The mean salary of the 22 respondents was $21,5l2} with a standard deviation of 52m}. On the other hand, 2B of the 313 respondents who reported earning more than $?D,UDD per year said that they were social networking users. The mean salary of the 2D respondents was $90,00 with a standard deviation of $3. (b) Estimate with 98% confidence the variance of salaries of the entire population of social network users earning less than $30,000 per year