please help with this question

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. 67.76 79.53 67.68 84.31 79.74 88.39 101.05 98.03% (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 99% condence interval for the mean tax paid for a three-day business trip. Select the correct choice below and ll in the answer boxes to complete your choice. (Round to two decimal places as needed.) 0 A- One can be |:|% condent that the mean travel tax for all cities is between $|:| and $|:|. O 5- There is a |:|% probability that the mean travel tax for all cities is between $|:| and $|:|. O c- The travel tax is between 15D and $|:| for |:|% of all cities. 0 D- One can be |:|% condent that all cities have a travel tax between $|:| and $|:|. (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? increase decrease 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. 67.76 79.53 67.68 84.31 79.74 88.39 101.05 98.03 (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 99% 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. One can be % confident that the mean travel tax for all cities is between $ and $ O B. There is a % probability that the mean travel tax for all cities is between $ and $ O C. The travel tax is between $ and $ for % of all cities. O D. One can be % confident that all cities have a travel tax between $ and $ (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? The researcher could the sample standard deviation. level of confidence. sample mean