« previous next »

Author Question: A random sample of 25 observations was selected from a normally distributed population. The average ... (Read 68 times)

darbym82

  • Hero Member
  • *****
  • Posts: 570
on: Jun 24, 2018
A random sample of 25 observations was selected from a normally distributed population. The average in the sample was 84.6 with a variance of 400.
 a. Construct a 90 confidence interval for .
  b. Construct a 99 confidence interval for .
  c. Discuss why the 90 and 99 confidence intervals are different.
  d. What would you expect to happen to the confidence interval in part (a) if the sample size was increased? Be sure to explain your answer.

Question 2

If you are deciding to buy either machine A, B, or C with the objective of minimizing the sum of labor, material and utility costs, you are dealing with a single-criterion decision.
  Indicate whether the statement is true or false


kjohnson

  • Sr. Member
  • ****
  • Posts: 330
Reply #1 on: Jun 24, 2018
Answer to Question 1

a. 77.756 to 91.444
b. 73.412 to 95.788
c. As the level of confidence increases, the confidence interval gets wider.
d. Decrease in width since the margin of error decreased.

Answer to Question 2

T


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

Did you know?

To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.

Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Sandia ear-plug-sized samplers hang poised to sample gases relevant to climate and weather. Sandia ear-plug-sized samplers hang poised to sample gases relevant to climate and weather.
Human Population Blasts Off Human Population Blasts Off
Selected Miscellaneous Antibacterials Selected Miscellaneous Antibacterials
Male Turkmen in the wealthier half of the population had higher fertility rates than those in the po Male Turkmen in the wealthier half of the population had higher fertility rates than those in the po
A sample flow sheet. A sample flow sheet.
Population Density versus Economic Growth Population Density versus Economic Growth
Video: Darwin's Observation (Fossils, Galapagos Islands & Africa ) and Natural Selection (Adaptive Traits)

For a complete list of videos, visit our video library