The Average Natural Gas Bill for a Random Sample of 21

question 81

Multiple Choice

The average natural gas bill for a random sample of 21 homes in 19810 zip code during the month of March was $311.90 with a sample standard deviation of $51.60.The 90% confidence interval around this sample mean is _______.

• A) [$285.98,$337.82]
• B) [$292.46,$331.34]
• C) [$278.09.$345.71]
• D) [$266.82,$356.98]

---

Definitions:

Extra Work

Tasks or responsibilities that go beyond the usual job requirements, often without additional compensation.

Mid-level Leaders

Leaders who manage the gap between the organization's strategic goals and its operational activities, typically overseeing several lower-level managers or departments.

Upper-level Leaders

Senior executives or top-tier managers within an organization who are responsible for making strategic decisions and guiding the entity's direction.

Lower-level Leaders

Leaders who operate at the initial layers of the organization, often directly overseeing the frontline or operational employees, and implementing day-to-day tasks.