« previous next »

Author Question: An economist is interested in studying the incomes of consumers in a particular country. The ... (Read 86 times)

nmorano1

  • Hero Member
  • *****
  • Posts: 598
on: Jun 24, 2018
An economist is interested in studying the incomes of consumers in a particular country. The population standard deviation is known to be 1,000. A random sample of 50 individuals resulted in a mean income of 15,000. What total sample size would the economist need to use for a 95 confidence interval if the width of the interval should not be more than 100?
 
  A) n = 40 B) n = 1537 C) n = 385 D) n = 20

Question 2

The head librarian at the Library of Congress has asked her assistant for an interval estimate of the mean number of books checked out each day. The assistant provides the following interval estimate: from 740 to 920 books per day. If the head librarian knows that the population standard deviation is 150 books checked out per day, and she asked her assistant to use 25 days of data to construct the interval estimate, what confidence level can she attach to the interval estimate?
 
  A) 99.7 B) 99.0 C) 95.4 D) 98.0


tandmlomax84

  • Sr. Member
  • ****
  • Posts: 323
Reply #1 on: Jun 24, 2018
Answer to Question 1

B

Answer to Question 2

A


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

nmorano1

  • Hero Member
  • *****
  • Posts: 598
Reply #2 on: Jun 24, 2018
Thank you


tandmlomax84

  • Sr. Member
  • ****
  • Posts: 323
Reply #3 on: Jun 24, 2018
No problemo


« previous next »
 

Did you know?

Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho
Why did these young volunteers of the First Virginia Militia join the Confederate army in 1861? “It Why did these young volunteers of the First Virginia Militia join the Confederate army in 1861? “It
W(illiam) E(dward) B(urghardt) Du Bois (1868–1963) spent his lifetime studying relations between ... W(illiam) E(dward) B(urghardt) Du Bois (1868–1963) spent his lifetime studying relations between ...
Age-standardized disability-adjusted life year (DALY) rates from hepatitis B by country (per 100 000 ... Age-standardized disability-adjusted life year (DALY) rates from hepatitis B by country (per 100 000 ...
Effect of an Increase in R&D in the Follower Country on the Steady State Effect of an Increase in R&D in the Follower Country on the Steady State
Me Studying and 5 Minutes Later Me Studying and 5 Minutes Later
Video: Chromosome structural organization/ Mechanisms for chromosome movement Animation

For a complete list of videos, visit our video library