Question: You may need to use the appropriate appendix table or technology to answer this question. The average monthly electric bill of a random sample

You may need to use the appropriate appendix table or technology 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 $117 with a standard deviation of $34. (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 $

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