This topic contains a solution. Click here to go to the answer

Author Question: Define observational study and designed experiment. What will be an ideal ... (Read 71 times)

tfester

  • Hero Member
  • *****
  • Posts: 534
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
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
Gracias!


duy1981999

  • Member
  • Posts: 341
Reply 3 on: Yesterday
:D TYSM

 

Did you know?

In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Did you know?

Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

For a complete list of videos, visit our video library