The accompanying data represent the total travel tax(in dollars) for a3-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.

68.29

78.17

69.26

83.28

80.45

87.56

100.43

(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 asneeded.)

(b) Construct and interpret a 95% confidence interval for the mean tax paid for athree-day business trip. (Round to two decimal places asneeded.)

A. One can be nothing % confident that the all cities have a travel tax between $ ______ and $ ______.

B. The travel tax is between $_____ and $______ for ____% of all cities.

C. There is a nothing % probability that the mean travel tax for all cities is between $ ___ and $ _____.

D. One can be ____ % confident 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 theinterval, but does not have access to additionaldata?

A. The researcher could increase the sample mean.

B. The researcher could increase the level of confidence.

C. The researcher could decrease the level of confidence.

D. The researcher could decrease the sample standard deviation.