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

Author Question: A random sample of 53 observations was taken. The average in the sample was 90 with a variance of ... (Read 141 times)

Yi-Chen

  • Hero Member
  • *****
  • Posts: 550
on: Jun 24, 2018
A random sample of 53 observations was taken. The average in the sample was 90 with a variance of 400.
 a. Construct a 98 confidence interval for .
  b. Construct a 99 confidence interval for .
  c. Discuss why the 98 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

The upper and lower control limits of the proportions of defectives of a process are 0.13 and 0.07.
 a. What has been the proportion of defectives in this process?
  b. What has been the sample size?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

cloudre37

  • Sr. Member
  • ****
  • Posts: 332
Reply #1 on: Jun 24, 2018
Answer to Question 1

a. 83.41 to 96.59 (rounded)
b. 82.65 to 97.35 (rounded)
c. As the level of confidence increases, the confidence interval gets wider.
d. Get narrower because the margin of error decreased.

Answer to Question 2

a. p = 0.10
b. n = 900


Yi-Chen

  • Hero Member
  • *****
  • Posts: 550
Reply #2 on: Jun 24, 2018
Thank you :)


cloudre37

  • Sr. Member
  • ****
  • Posts: 332
Reply #3 on: Jun 24, 2018
Happy to help you


« previous next »
 

Did you know?

The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Mononucleosis is caused by the Epstein–Barr virus. Symptoms of the infectious disease are swollen pa Mononucleosis is caused by the Epstein–Barr virus. Symptoms of the infectious disease are swollen pa
Nurse examining and measuring hematuria sample from client with a UTI Nurse examining and measuring hematuria sample from client with a UTI
Sample Student Externship Form Sample Student Externship Form
Sample prescriptions of antibiotics for dental infections. Sample prescriptions of antibiotics for dental infections.
If the random variable x is exponentially distributed with parameter λ = 4, then P(x ≤ ... If the random variable x is exponentially distributed with parameter λ = 4, then P(x ≤ ...
Mendel’s observations about segregation and independent assortment are explained by the behavior ... Mendel’s observations about segregation and independent assortment are explained by the behavior ...
Video: Introduction to Dysrhythmia

For a complete list of videos, visit our video library