The Average Monthly Electric Bill of a Random Sample of 256

question 65

Short Answer

The average monthly electric bill of a random sample of 256 residents of a city is $90. The population standard deviation is assumed to be $24.
a.Construct a 90% confidence interval for the mean monthly electric bills of all residents.
b.Construct a 95% confidence interval for the mean monthly electric bills of all residents.

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Definitions:

Oral Medium

An oral medium refers to communication or expression through spoken words, as opposed to written or visual forms.

Physical Space

Physical space refers to the tangible, three-dimensional environment in which humans live, work, and interact.

Immediate Interactions

Direct and instant communication or engagement between individuals or entities.

Written, Printed

Material that is expressed in letters, characters, or symbols on a surface such as paper to communicate ideas or information.