« previous next »

Author Question: Suppose that a student needs to buy 6 books for her history course. The number of books that she ... (Read 212 times)

Lisaclaire

  • Hero Member
  • *****
  • Posts: 569
on: Jul 24, 2018
Suppose that a student needs to buy 6 books for her history course. The number of books that she will be able to find used is a binomial random variable X with n = 6 and p = 0.30 . In other words, the probability that she will find any given book used is 0.30, and is independent from one book to the next. What is the variance for the number of used books she will find, V(X)?
 a. 0.54
  b. 1.12
  c. 1.26
  d. 61.80

Question 2

A television station plans to ask a random sample of 400 city residents if they can name the news anchor on the evening news at their station. They plan to fire the news anchor if fewer than 10 of the residents in the sample can do so. Suppose that 12 of city residents in the sample could name the anchor when asked. Explain in your own words what the 95 confidence level implies.


hramirez205

  • Sr. Member
  • ****
  • Posts: 345
Reply #1 on: Jul 24, 2018
Answer to Question 1

C

Answer to Question 2

If repeated samples of size 400 were taken, 95 of the resulting confidence intervals would contain the population proportion of city residents who can name the news anchor on the evening news at their station.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

Did you know?

Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

Every flu season is different, and even healthy people can get extremely sick from the flu, as well as spread it to others. The flu season can begin as early as October and last as late as May. Every person over six months of age should get an annual flu vaccine. The vaccine cannot cause you to get influenza, but in some seasons, may not be completely able to prevent you from acquiring influenza due to changes in causative viruses. The viruses in the flu shot are killed—there is no way they can give you the flu. Minor side effects include soreness, redness, or swelling where the shot was given. It is possible to develop a slight fever, and body aches, but these are simply signs that the body is responding to the vaccine and making itself ready to fight off the influenza virus should you come in contact with it.

Types of variation in chromosome number. Types of variation in chromosome number.
books books
When the number of miles traveled is considered, drivers under 25 years of age and those over 70 are ... When the number of miles traveled is considered, drivers under 25 years of age and those over 70 are ...
Hurricane Paths: Major Hurricane History Hurricane Paths: Major Hurricane History
Directions: Fill in the correct number or word(s). Order: Lantus U-100 insulin 68 units subcut ... Directions: Fill in the correct number or word(s). Order: Lantus U-100 insulin 68 units subcut ...
A highway curve of radius 80 m is banked at 45°. Suppose that an ice storm hits, and the ... A highway curve of radius 80 m is banked at 45°. Suppose that an ice storm hits, and the ...
Video: Cardiac conductile cells

For a complete list of videos, visit our video library