I need help figuring out how to do these 2 homework questions I am pretty lost, thanks.

Homework: Section 9.2 Save Score: 0 of 1 pt 5 of 8 (4 complete) HW Score: 33.33%, 2.67 of 8 pts 9.2.32 iQuestion Help The accompanying data represent the total travel tax (in dollars) for a 3-day business trip in 8 randomly selected cities. A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates there are no outliers. Complete parts (a) through (c) below. 68.22 79.66 70.72 83.41 80.75 86.73 101.14 97.64 Click the icon to view the table of critical t-values. (a) Determine a point estimate for the population mean travel tax. A point estimate for the population mean travel tax is $. (Round to two decimal places as needed.)(b) Construct and interpret a 95% confidence interval for the mean tax paid for a three-day business trip Select the correct choice below and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.) O A. The lower bound is $ and the upper bound is $ One can be % confident that all cities have a travel tax between these values. O B. The lower bound is $ and the upper bound is $ The travel tax is between these values for % of all cities. O C. The lower bound is $ and the upper bound is $ There is a % probability that the mean travel tax for all cities is between these values. D. The lower bound is $ and the upper bound is $ One can be 95% confident that the mean travel tax for all cities is between these values. (c) What would you recommend to a researcher who wants to increase the precision of the interval, but does not have access to additional data? A. The researcher could decrease the level of confidence. O B. The researcher could decrease the sample standard deviation. O C. The researcher could increase the level of confidence. O D. The researcher could increase the sample mean.ID mathxl.com C Assignments Do Homework - Kaylee Phares Answered: A doctor wants to estimate the mean HDL... | bar.. Course Hero MAT 152 Summer Online Bradham Kaylee Phares & | 07/05/20 3:00 PM Homework: Section 9.2 Save Score: 0 of 1 pt 7 of 8 (5 complete) HW Score: 45.83%, 3.67 of 8 pts 9.2.41 Question Help A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 2 points with 99% confidence assuming s = 19.8 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject.) ? Enter your answer in the answer box and then click Check Answer. Check Answer 1 parts Clear All remaining MacBook Air