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

Author Question: What sample size should be used if we would like to estimate the mean age of the individuals who ... (Read 105 times)

LCritchfi

  • Hero Member
  • *****
  • Posts: 519

  What sample size should be used if we would like to estimate the mean age of the individuals who are attend a university with a 95 confidence interval that has a width of at most 5 years? Assume the population is normally distributed with a standard deviation of 4.2 years.
 

  a.The sample size should be 10.
  b.The sample size should be 19.
  c.The sample size should be 11.
 

d.The sample size should be 8.
 
 



Question 2


  Which of the following is the correct formula for a confidence interval for when both and are estimated?
 

  a. with df = n - 1
  b. with df = n - 1
  c. with df = n - 1
 

d.
 
 




Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

asdfasdf

  • Sr. Member
  • ****
  • Posts: 339
Answer to Question 1

correct: c

Answer to Question 2

correct: a




LCritchfi

  • Member
  • Posts: 519
Reply 2 on: Jul 24, 2018
:D TYSM


cici

  • Member
  • Posts: 325
Reply 3 on: Yesterday
Great answer, keep it coming :)

 

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Did you know?

Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

For a complete list of videos, visit our video library