This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Define observational study and designed experiment. What will be an ideal ... (Read 25 times)

tfester

  • Hero Member
  • *****
  • Posts: 534
on: Jul 25, 2018
Define observational study and designed experiment.
 
  What will be an ideal response?

Question 2

A census bureau collects information about the household income (total income of everyone living in one residence) of people in a certain country.
  (i) Identify the variable and population under consideration.
 
  (ii) By consulting the most recent census data, it was found that the mean household income of all residents in the country is 35,352. Decide whether this descriptive measure is a parameter or a statistic and use the correct notation to express the result.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Kingjoffery

  • Sr. Member
  • ****
  • Posts: 332
Reply #1 on: Jul 25, 2018
Answer to Question 1

In an observational study, researchers simply observe and measure specific characteristics as in a sample survey. In a designed experiment researchers apply some treatment and controls and then proceed to observe its effects on the subjects and take measurements.

Answer to Question 2

(i) The population consists of all heads-of-household in the country. The variable of interest is the household income of each residence.
(ii) The mean of 35,352 is a parameter since it is derived from the entire population. Thus, we write  = 35,352.


tfester

  • Member
  • Posts: 534
Reply 2 on: Jul 25, 2018
Thanks for the timely response, appreciate it

jamesnevil303

  • Member
  • Posts: 337
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

Did you know?

The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

Did you know?

It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.

Did you know?

The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

A study by Seehausen and van Alphen involving the effects of male coloration on female choice in Afr A study by Seehausen and van Alphen involving the effects of male coloration on female choice in Afr
Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the
Biochem study guides Biochem study guides
Miller-Urey Experiment Updated Miller-Urey Experiment Updated
Example of pre- and posttest Interpretation in an Experiment Example of pre- and posttest Interpretation in an Experiment
The Taylor–Woods–Hughes experiment The Taylor–Woods–Hughes experiment
Video: Structures that affect circulation - arterioles and vasomotor responses and venous return

For a complete list of videos, visit our video library