Mathematics, 15.07.2020 03:01 lancaster4977p8mk46
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.
67.85 78.62 70.28 84.03 79.28 87.72 101.54 97.28
1. Determine a point estimate for the population mean travel tax.
2. Construct and interpret a 95% confidence interval for the mean tax paid for a three-day business trip.
Filling the missing boxes.
The lower bound is $and the upper bound is $. One can be% confident that all cities have a travel tax between these values.
The lower bound is $and the upper bound is $. The travel tax is between these values for% of all cities.
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.
The lower bound is $and the upper bound is. One can be% confident that the mean travel tax for all cities is between these values.
3. 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.
B. The researcher could decrease the sample standard deviation.
C. The researcher could increase the level of confidence.
D. The researcher could increase the sample mean.
Answers: 2
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