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(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? OA. 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.

(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? OA. 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.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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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.
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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