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

Author Question: A random sample of 53 observations was taken. The average in the sample was 90 with a variance of ... (Read 131 times)

Yi-Chen

  • Hero Member
  • *****
  • Posts: 550
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
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





 

Did you know?

Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

Did you know?

Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

Did you know?

Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

Did you know?

According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

For a complete list of videos, visit our video library