The Average Monthly Electric Bill of a Random Sample of 256

question 20

Short Answer

The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $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.

---

Definitions:

Weight and Body Composition

Refers to the distribution of fat, muscle, and bone mass in the body, influencing overall health and physical fitness.

Phonological Processing

The use of sounds of a language to process verbal information in oral and written forms, which is critical for reading development.

Naming Speed

The ability to quickly recall and articulate the names of objects, symbols, or colors, often used as an indicator of language and reading proficiency.

Self-Image

Self-image is the mental representation that one has of oneself, including perceptions of one's attributes, abilities, and appearance.