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. 68.84 78.53 70.32 84.34 79.48 87.37 1 Click the icon to view the table of critical t-values. 100.48 99.07 (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 travel tax is between $ and $ for %Of all cities. O B. One can be % confident that the mean travel tax for all cities is between and S O C. One can be % confident that the all cities have a travel tax between and S O D. There is a % probability that the mean travel tax for all cities is 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? A. The researcher could increase the level of confidence. O B. The researcher could decrease the sample standard deviation. C. The researcher could increase the sample mean. O D. The researcher could decrease the level of confidence.

Answer 1