You may need to use the appropriate appendix table or technology to answer this question. The average monthly electric bill of a random sample of 256 residents of a city is $112 with a standard deviation of $39. (a) Construct a 90% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) to $ (b) Construct a 95% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) to $ $
You may need to use the appropriate appendix table or technology to answer this question. The average monthly electric bill of a random sample of 256 residents of a city is $112 with a standard deviation of $39. (a) Construct a 90% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) to $ (b) Construct a 95% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) to $ $
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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