« previous next »

Author Question: Whenever the population standard deviation is unknown, which distribution is used in developing an ... (Read 75 times)

RODY.ELKHALIL

  • Hero Member
  • *****
  • Posts: 591
on: Jun 24, 2018
Whenever the population standard deviation is unknown, which distribution is used in developing an interval estimate for a population mean?
 a. standard distribution
  b. z distribution
  c. binomial distribution
  d. t distribution

Question 2

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. What is the probability that a randomly selected tire will have a life of exactly 47,500 miles?
 a. .4332
  b. .9332
  c. .0668
  d. 0


triiciiaa

  • Sr. Member
  • ****
  • Posts: 349
Reply #1 on: Jun 24, 2018
Answer to Question 1

d

Answer to Question 2

d


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Did you know?

Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

World human population growth through history illustrates an exponential growth pattern. World human population growth through history illustrates an exponential growth pattern.
Area of Manatee Population Area of Manatee Population
ROM exercises on a patient’s wrist: ulnar deviation. ROM exercises on a patient’s wrist: ulnar deviation.
Generalized scheme showing the contribution of absorption, distribution, metabolism, elimination, ... Generalized scheme showing the contribution of absorption, distribution, metabolism, elimination, ...
Population and Settlement Population and Settlement
How to quickly find the vertex of a quadratic equation that is in standard form How to quickly find the vertex of a quadratic equation that is in standard form
Video: Eczema

For a complete list of videos, visit our video library