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 113 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?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

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?

There are more sensory neurons in the tongue than in any other part of the body.

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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
Self-Esteem in a Longitudinal Sample Self-Esteem in a Longitudinal Sample
Sample Student Externship Form Sample Student Externship Form
Sample of Enzymes Sample of Enzymes
Sample prescriptions of antibiotics for dental infections. Sample prescriptions of antibiotics for dental infections.
Sample prescriptions of drugs for oral fungal infections. Sample prescriptions of drugs for oral fungal infections.
Video: Gas exchange - driving force

For a complete list of videos, visit our video library