MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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need help with question c
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 79.09 69.71 84.91 80.91 85.76 100.24 97.41 O A 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 $ 83.28 (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. One can be % confident that the all cities have a travel tax between $ and $. O B. There is a % probability that the mean travel tax for all cities between $ and $. C. One can be 95 % confident that the mean travel tax for all cities is between $ 73.64 and $ 92.92 D. The travel tax is between $ and $ for % of all cities. (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? O A. The researcher could decrease the level of confidence. O B. The researcher could decrease the sample standard deviation. Oc. The researcher could increase the level of confidence. O D The researcher could increase the sample mean.
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Transcribed Image Text: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 79.09 69.71 84.91 80.91 85.76 100.24 97.41 O A 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 $ 83.28 (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. One can be % confident that the all cities have a travel tax between $ and $. O B. There is a % probability that the mean travel tax for all cities between $ and $. C. One can be 95 % confident that the mean travel tax for all cities is between $ 73.64 and $ 92.92 D. The travel tax is between $ and $ for % of all cities. (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? O A. The researcher could decrease the level of confidence. O B. The researcher could decrease the sample standard deviation. Oc. The researcher could increase the level of confidence. O D The researcher could increase the sample mean.
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