In Order to Estimate the Average Electric Usage Per Month

question 89

Multiple Choice

In order to estimate the average electric usage per month, a sample of 64 houses was selected and the electric usage was determined. Assume a population standard deviation of 320 kilowatt-hours. If the sample mean is 1858 kWh, the 95% confidence interval estimate of the population mean is _____ kWh.

• A) 1779.6 to 1936.4
• B) 1818 to 1898
• C) 1792.2 to 1923.8
• D) 1538 to 2178

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Definitions:

Boxplot

A graphical representation used in descriptive statistics that displays the distribution of data based on a five number summary: minimum, first quartile, median, third quartile, and maximum.

Summary Statistics

Numerical values calculated from a dataset, intended to provide information about the characteristics of the data.

Measures

Quantitative indicators or metrics used to assess, compare, or track performance or progress.

Track Team

A group of athletes who compete in track and field events, including running races, jumping, and throwing disciplines.