Author Question: A research firm has been contracted to estimate the mean weekly family expenditure on clothes. He ... (Read 79 times)

penza

  • Hero Member
  • *****
  • Posts: 1,022
A research firm has been contracted to estimate the mean weekly family expenditure on clothes. He believes that the standard deviation of the weekly expenditure is 125 . Determine with 99 confidence the number of families that must be sampled to estimate the mean weekly family expenditure on clothes to within 15.

Question 2

If the value of the Durbin-Watson test statistic, d, satisfies the inequality d > 4 - dL, we conclude that positive first-order autocorrelation exists.
  Indicate whether the statement is true or false



alexanderhamilton

  • Sr. Member
  • ****
  • Posts: 334
Answer to Question 1

n = 463 (using z = 2.58)

Answer to Question 2

F



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

Did you know?

Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

Did you know?

Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

For a complete list of videos, visit our video library